Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"OLSEN ORVING C" Page 1

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发明授权
Private branch exchange telephone system 失效

公开(公告)号：US3037087A

公开(公告)日：1962-05-29

申请号：US4659560

申请日：1960-08-01

Applicant: BELL TELEPHONE LABOR INC

Inventor： ABBOTT HENRY H , MARTIN CHARLES R , OLSEN ORVING C , PREVITE RICHARD A , WALSH HENRY J , WALSH JOHN G

IPC: H04M9/00

CPC classification number: H04M9/00

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