-
公开(公告)号：US1717062A
公开(公告)日：1929-06-11
申请号：US12623326
申请日：1926-07-31
Applicant: BELL TELEPHONE LABOR INC
Inventor： PHELPS WALTER A
IPC: H04L27/14
CPC classification number: H04L27/14
Search Results
11
records
(took 0.025 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
