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公开(公告)号：US874540A
公开(公告)日：1907-12-24
申请号：US1906340788
申请日：1906-10-26
Applicant: RAMSDELL JAMES HOWELL
Inventor： RAMSDELL JAMES HOWELL
CPC classification number: F16B39/32 , Y10S411/953 , Y10T279/17941
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公开(公告)号：US1031676A
公开(公告)日：1912-07-02
申请号：US1911647460
申请日：1911-09-02
Applicant: RAMSDELL JAMES HOWELL
Inventor： RAMSDELL JAMES HOWELL
CPC classification number: E01B11/10
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