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公开(公告)号：US3414689A
公开(公告)日：1968-12-03
申请号：US46721265
申请日：1965-06-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： GUMMEL HERMANN K , RIDEOUT VINCENT L
IPC: H04M1/03
CPC classification number: H04M1/03
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