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公开(公告)号：US2880018A
公开(公告)日：1959-03-31
申请号：US51568255
申请日：1955-06-15
Applicant: PFAUDLER PERMUTIT INC
Inventor： ROBINSON MELVIN B , HARRISON EDWARD S
IPC: F16L41/00
CPC classification number: F16L41/001 , Y10S285/911
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