Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"KINKEAD RITA S" Page 1

1.

发明授权
Printing telegraph automatic switching system 失效

公开(公告)号：US2430447A

公开(公告)日：1947-11-11

申请号：US44887842

申请日：1942-06-27

Applicant: BELL TELEPHONE LABOR INC

Inventor： BRANSON DAVID E , KINKEAD RITA S , KRECEK JOSEPH A , LOCKE GEORGE A

IPC: H04L12/54

CPC classification number: H04L12/54

Patent Agency Ranking