-
公开(公告)号：US2219590A
公开(公告)日：1940-10-29
申请号：US12150737
申请日：1937-01-21
Applicant: FRACKER HENRY E
Inventor： FRACKER HENRY E
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
