Common use of Transfer or Assignment of Registration Rights Clause in Contracts

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇/▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇/▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇ .▇. ▇▇▇▇▇ ----------------------------------- ▇▇ ----------------------------------------- ▇▇▇▇▇ .▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇----------------------------------- ▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇----------------------------------- ▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇ . ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇ . ▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇ ----------------------------------------- ▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 1213, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 1214, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: ▇▇▇▇ Minerals Company By: /s/ ▇▇▇▇▇▇▇ ▇. ▇▇▇▇ ▇▇▇▇▇▇▇▇▇ ----------------------------------------- ----------------------------------- ▇▇▇▇▇▇▇ ▇. ▇▇▇▇ ▇▇▇▇▇▇▇▇▇ Attorney-In-Fact Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇ ▇. ▇▇▇ ----------------------------------- ▇▇▇ ▇▇▇▇▇ ▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ G. O. ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- G. O. ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇▇▇ ▇. ▇▇▇▇ ----------------------------------- ▇▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ----------------------------------- ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 12, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇ Date: November 1213, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):

Transfer or Assignment of Registration Rights. The rights to cause --------------------------------------------- the company to register securities granted to a Holder by the company under this Section1 may be transferred or assigned by a Holder only to a transferee or assignee of not less than one half of the Shares held by such Holder on the date hereof (as presently constituted and proportionately adjusted.... Please sign in the space provided below and fax to me as soon as possible in Dallas at ▇▇▇-▇▇▇-▇▇▇▇. Sincerely, ▇▇▇▇▇▇ OIL CORPORATION /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ President KEM/sc Agreed and Accepted: By: /s/ ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇ ----------------------------------------- ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Date: November 12__, 1997 [LETTERHEAD APPEARS HERE] November 12, 1997 Facsimile Transmission ---------------------- To: Combination Transaction Participants Dear Participants: In reference to the Clarification of Registration Rights Agreement please ---------------------------------------------- note the following change: The first portion of Section 1.7 of the registration Rights Agreement should read as follows (italicized language inserted):