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公开(公告)号:US2525111A
公开(公告)日:1950-10-10
申请号:US9375149
申请日:1949-05-17
Applicant: ALFRED ASTPHAN
Inventor: ALFRED ASTPHAN
IPC: D06C5/00 , D06F71/08
CPC classification number: D06C5/005 , D06F71/08