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公开(公告)号：US2294160A
公开(公告)日：1942-08-25
申请号：US33341840
申请日：1940-05-04
Applicant: CRANE LEONARD G , TILLSON HAROLD J
Inventor： CRANE LEONARD G , TILLSON HAROLD J
IPC: F16L49/06
CPC classification number: F16L49/06 , Y10S285/911
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