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公开(公告)号：US3080667A
公开(公告)日：1963-03-12
申请号：US10712161
申请日：1961-05-02
Applicant: MC GRAW EDISON CO
Inventor： NECKEL EDMUND N , EYGABROAD ROBERT J
IPC: D06F71/22
CPC classification number: D06F71/22
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