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公开(公告)号：US3219244A
公开(公告)日：1965-11-23
申请号：US35279064
申请日：1964-03-18
Applicant: BLASK BENNETT C
Inventor： BLASK BENNETT C
IPC: F42B39/02
CPC classification number: F42B39/02 , F42B39/002
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