CREDIT AGREEMENT dated as of December 7, 2017 among IPSCO TUBULARS INC., TMK IPSCO INTERNATIONAL, L.L.C., IPSCO KOPPEL TUBULARS, L.L.C., IPSCO TUBULARS (KY) INC., and ULTRA PREMIUM OILFIELD SERVICES, LTD., and any other Person who becomes a party to...