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公开(公告)号：US2413149A
公开(公告)日：1946-12-24
申请号：US54255244
申请日：1944-06-28
Applicant: MCCARTHY ROBERT E , BENDER EMIL A
Inventor： MCCARTHY ROBERT E , BENDER EMIL A
IPC: E21B15/00
CPC classification number: E21B15/00
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