Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"CERBONE RALPH L" Page 1

1.

发明授权
Direct station selection telephone set employing proximity type selector switches 失效
Title translation: 直接选择电话机使用接近型选择开关

公开(公告)号：US3492440A

公开(公告)日：1970-01-27

申请号：US3492440D

申请日：1967-05-25

Applicant: BELL TELEPHONE LABOR INC

Inventor： CERBONE RALPH L , FLAVIN MICHAEL A , HALL NORRIS R , RIEKE JOHN W

IPC: H04M1/23 , H04M1/2745 , H04Q3/00 , H04M1/26 , H01H35/00

CPC classification number: H04Q3/00 , H03K2217/96077 , H04M1/23 , H04M1/274591

Patent Agency Ranking