-
公开(公告)号：US2452652A
公开(公告)日：1948-11-02
申请号：US54763844
申请日：1944-08-01
Applicant: BELL TELEPHONE LABOR INC
Inventor： HANSEN ROLF K
IPC: H01J5/24
CPC classification number: H01J5/24 , H01J2893/0039
Search Results
1
records
(took 0.009 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
