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公开(公告)号：US3242955A
公开(公告)日：1966-03-29
申请号：US38615064
申请日：1964-07-30
Applicant: DETROIT TAP & TOOL COMPANY
Inventor： HELLSTROM LENNART M
IPC: B27L7/00
CPC classification number: B27L7/00
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