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公开(公告)号：US1807367A
公开(公告)日：1931-05-26
申请号：US33629629
申请日：1929-01-30
Applicant: WOOLERY MACHINE COMPANY
Inventor： WOOLERY HORACE E
IPC: E01B29/24
CPC classification number: E01B29/28 , Y10T74/19274 , Y10T408/5565 , Y10T408/6771
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公开(公告)号：US1636161A
公开(公告)日：1927-07-19
申请号：US75634324
申请日：1924-12-16
Applicant: WOOLERY MACHINE COMPANY
Inventor： WOOLERY HORACE E
IPC: E01H11/00
CPC classification number: E01H11/00
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公开(公告)号：US1925164A
公开(公告)日：1933-09-05
申请号：US35506829
申请日：1929-04-15
Applicant: WOOLERY MACHINE COMPANY
Inventor： WOOLERY HORACE E
IPC: E01H11/00
CPC classification number: E01H11/00
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