-
公开(公告)号：US2639149A
公开(公告)日：1953-05-19
申请号：US12562249
申请日：1949-11-04
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAMPTON LEON N , MARTIN SALZER
IPC: G06K13/077 , H04M3/08
CPC classification number: G06K13/077 , H04M3/08
Search Results
1
records
(took 0.008 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
