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公开(公告)号:US1250023A
公开(公告)日:1917-12-11
申请号:US7682516
申请日:1916-02-07
申请人: RUDOLPH JOHN
发明人: RUDOLPH JOHN
CPC分类号: E03D1/165 , Y10T137/2795 , Y10T137/7319 , Y10T137/7323 , Y10T137/7475
公开(公告)号:US1250023A
公开(公告)日:1917-12-11
申请号:US7682516
申请日:1916-02-07
申请人: RUDOLPH JOHN
发明人: RUDOLPH JOHN
CPC分类号: E03D1/165 , Y10T137/2795 , Y10T137/7319 , Y10T137/7323 , Y10T137/7475