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公开(公告)号：US2471300A
公开(公告)日：1949-05-24
申请号：US61455145
申请日：1945-09-05
Applicant: DAVID BLOCK
Inventor： DAVID BLOCK
IPC: A44C5/22
CPC classification number: A44C5/22 , Y10T24/2166
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