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公开(公告)号：US2452411A
公开(公告)日：1948-10-26
申请号：US48697343
申请日：1943-05-14
Applicant: WOOLERY MACHINE COMPANY
Inventor： LILLIAN WOOLERY MYRA
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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