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公开(公告)号:US2143568A
公开(公告)日:1939-01-10
申请号:US19880038
申请日:1938-03-30
Applicant: MUNRO JOHN H
Inventor: MUNRO JOHN H
IPC: F16L19/06 , F16L27/12
CPC classification number: F16L27/12 , F16L19/06