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公开(公告)号：US1589199A
公开(公告)日：1926-06-15
申请号：US3412525
申请日：1925-06-01
Applicant: MALCOLM MCNEILL JOHN
Inventor： MALCOLM MCNEILL JOHN
IPC: E01F9/00
CPC classification number: E01F9/00
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公开(公告)号：US1504565A
公开(公告)日：1924-08-12
申请号：US66592323
申请日：1923-10-01
Applicant: MALCOLM MCNEILL JOHN
Inventor： MALCOLM MCNEILL JOHN
IPC: E04H13/00
CPC classification number: E04H13/003
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