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公开(公告)号：US2428593A
公开(公告)日：1947-10-07
申请号：US40625641
申请日：1941-08-11
Applicant: KELLOGG SWITCHBOARD & SUPPLY
Inventor： TEAGUE WALTER D , TEAGUE JR WALTER D
IPC: H04M1/08
CPC classification number: H04M1/08
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