Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"TWEED DONALD G" Page 1

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发明授权
Telephone call transmitter 失效
Title translation: 电话呼叫发射机

公开(公告)号：US3109071A

公开(公告)日：1963-10-29

申请号：US86054959

申请日：1959-12-18

Applicant: BELL TELEPHONE LABOR INC

Inventor： MITCHELL CLIFFORD E , PRESCOTT ROBERT E , LEO SCHENKER , TWEED DONALD G

IPC: H01H13/12 , H01H13/72 , H04M1/23

CPC classification number: H01H13/72 , H01H13/12 , H04M1/23

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