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公开(公告)号：US2303690A
公开(公告)日：1942-12-01
申请号：US32844440
申请日：1940-04-08
Applicant: HUFFMAN MFG COMPANY
Inventor： HALL KENNETH R , HORSTMAN JOHN H
IPC: F16K31/58
CPC classification number: F16K31/58
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