-
公开(公告)号：US1354861A
公开(公告)日：1920-10-05
申请号：US25434418
申请日：1918-09-16
Applicant: JAMES TONGE
Inventor： JAMES TONGE
IPC: E21C37/08
CPC classification number: E21C37/08
Search Results
1
records
(took 0.013 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
