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公开(公告)号：US2726044A
公开(公告)日：1955-12-06
申请号：US34735453
申请日：1953-04-07
Applicant: WARREN TOOL CORP
Inventor： ENDSLEY LOUIS E , MCINTYRE RALPH W
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/08
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公开(公告)号：US2726043A
公开(公告)日：1955-12-06
申请号：US27506352
申请日：1952-03-06
Applicant: WARREN TOOL CORP
Inventor： ENDSLEY LOUIS E
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/08
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