-
公开(公告)号：US1738293A
公开(公告)日：1929-12-03
申请号：US24730928
申请日：1928-01-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： GOODERHAM JOHN W
IPC: H04M15/28
CPC classification number: H04M15/28
Search Results
21
records
(took 0.014 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
