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公开(公告)号：US1460387A
公开(公告)日：1923-07-03
申请号：US39683220
申请日：1920-07-16
Applicant: JAMES MCCRACKEN JOHN
Inventor： JAMES MCCRACKEN JOHN
IPC: G01C21/02
CPC classification number: G01C21/02
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