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p «• interest, including Defense Plant Corporation* Reconstruction Finance Corporation, the State of Nevada, or the Colorado River Commission of Nevada, in connection with any application for a right of way under any statute of the United States, which application Is still pending, or has been granted, and is unrevoked and has been transferred to and Is now owned by said Basic Management, Inc., then, upon the approval by the Secretary of the Interior of any such later map with such modi­fications and under sxich conditions as he may deem appropriate, the rights hereby granted, shall as to such lands or rights ©* way become effective as of the date of the filing oi said earlier map or maps with the manager or register of the United States local land office. Sec. 3. Said grants are to be made subject to rights of way, easements, and permits heretofore granted or allowed to any person or corporation in accordance with any Act or Acts of Congress and subject to the rights of all claimants or persons who shall have filed or made valid claims, locations, or entries on or to said lands, or any part thereof prior to the effective date of any conflicting grant hereunder, unless prior to such effective date proper relinquishments or quit­claims have been procured and caused to be filed In the proper land office. Sec. 41 That, whenever the land granted herein shall cease to be used for the purposes for which it is granted, the estate of the grantee or of its assigns shall terminate and revest In the United States, 3.