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公开(公告)号：US3039827A
公开(公告)日：1962-06-19
申请号：US84155659
申请日：1959-09-22
Applicant: CONSOLIDATION COAL CO
Inventor： POUNDSTONE WILLIAM N , REAM VINCENT H , JONES SAM A
IPC: E21F5/10
CPC classification number: E21F5/10
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