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公开(公告)号：US1952167A
公开(公告)日：1934-03-27
申请号：US54733231
申请日：1931-06-27
Applicant: UNITED RES CORP
Inventor： HASBROUCK HAROLD J , DREISBACH ROBERT H
IPC: H04R1/28
CPC classification number: H04R7/26 , H04R2307/201
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