Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"MARTIN HAROLD T" Page 1

1.

发明授权
Reeling device 失效

公开(公告)号：US1861221A

公开(公告)日：1932-05-31

申请号：US33644929

申请日：1929-01-31

Applicant: BELL TELEPHONE LABOR INC

Inventor： MARTIN HAROLD T , HOYT FREDERICK A

IPC: H02G11/02 , H04M1/15

CPC classification number: H04M1/15 , H02G11/02

Patent Agency Ranking