-
公开(公告)号：US1854371A
公开(公告)日：1932-04-19
申请号：US47408430
申请日：1930-08-09
Applicant: WILLIAM ENGEL
Inventor： WILLIAM ENGEL
IPC: H01J19/46
CPC classification number: H01J19/46 , H01J2893/0007
Search Results
1
records
(took 0.007 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
