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公开(公告)号：US1481062A
公开(公告)日：1924-01-15
申请号：US49232721
申请日：1921-08-15
Applicant: LLOYD JOHNSON
Inventor： LLOYD JOHNSON
IPC: F16L21/00
CPC classification number: F16L21/007 , Y10S285/906 , Y10T403/452 , Y10T403/7011
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