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公开(公告)号：US3145389A
公开(公告)日：1964-08-25
申请号：US16888362
申请日：1962-01-26
Applicant: SINGER CO
Inventor： RALPH HUGHES
IPC: B27F4/00
CPC classification number: B27F4/00
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公开(公告)号：US3286649A
公开(公告)日：1966-11-22
申请号：US16894762
申请日：1962-01-26
Applicant: SINGER CO
Inventor： RALPH HUGHES
CPC classification number: E01B31/28 , B27F4/00 , Y10T29/49833
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公开(公告)号：US3273424A
公开(公告)日：1966-09-20
申请号：US35849964
申请日：1964-04-09
Applicant: SINGER CO
Inventor： RALPH HUGHES
IPC: E01B31/06
CPC classification number: E01B31/06 , Y10T408/5612 , Y10T408/5623 , Y10T408/6757
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