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公开(公告)号：US2821339A
公开(公告)日：1958-01-28
申请号：US60881756
申请日：1956-09-10
Applicant: WYBLE ENGINEERING DEV CORP
Inventor： WYBLE KEITH D
IPC: B04B5/04
CPC classification number: B04B5/04 , B04B5/0414
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