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公开(公告)号：US1809264A
公开(公告)日：1931-06-09
申请号：US33390429
申请日：1929-01-21
Applicant: RALPH C WHITLOCK PATENTS INC
Inventor： ALLEN WILBUR C
CPC classification number: B41K3/64 , G07B17/00467 , Y10T74/11
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