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公开(公告)号：US1773445A
公开(公告)日：1930-08-19
申请号：US18060927
申请日：1927-04-02
Applicant: ROBESON PROCESS COMPANY
Inventor： BULLEN BENJAMIN W , WALLACE FREDRICK J
IPC: H01M6/22
CPC classification number: H01M6/22
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