-
公开(公告)号：US1906792A
公开(公告)日：1933-05-02
申请号：US28483328
申请日：1928-06-12
Applicant: JOHN GWILLIM
Inventor： JOHN GWILLIM
IPC: B02C4/40
CPC classification number: B02C4/40
Search Results
1
records
(took 0.01 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
