-
公开(公告)号：US1880715A
公开(公告)日：1932-10-04
申请号：US48094030
申请日：1930-09-10
Applicant: BELL TELEPHONE LABOR INC
Inventor： BJORNSON BJORN G , HORTON JR ARTHUR W , NORWINE ANDREW C
IPC: H04B3/20
CPC classification number: H04B3/20
Search Results
11
records
(took 0.011 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
