-
公开(公告)号：US2356035A
公开(公告)日：1944-08-15
申请号：US42005641
申请日：1941-11-22
Applicant: BELL TELEPHONE LABOR INC
Inventor： DOWNING HENRY L , WEST JOHN W
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
Search Results
1
records
(took 0.009 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
