-
公开(公告)号：US1782378A
公开(公告)日：1930-11-18
申请号：US22687627
申请日：1927-10-18
Applicant: EMIL BAHR
Inventor： EMIL BAHR
IPC: G04B23/00
CPC classification number: G04B23/005
Search Results
1
records
(took 0.007 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
