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公开(公告)号：US1808229A
公开(公告)日：1931-06-02
申请号：US28784428
申请日：1928-06-23
Applicant: CUTLER HAMMER INC
Inventor： HUNTER RICHARD B , PAULY ROBERT C
IPC: D06F71/04
CPC classification number: D06F71/046
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