CREDIT AND GUARANTY AGREEMENT (FIRST LIEN) dated as of May 25, 2010 among XERIUM TECHNOLOGIES, INC., XTI LLC, XERIUM ITALIA S.P.A., XERIUM CANADA INC., HUYCK.WANGNER AUSTRIA GMBH and XERIUM GERMANY HOLDING GMBH as Borrowers, CERTAIN SUBSIDIARIES OF...