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公开(公告)号：US2304841A
公开(公告)日：1942-12-15
申请号：US41261141
申请日：1941-09-27
Applicant: MIKKELSEN HARRY E
Inventor： MIKKELSEN HARRY E
CPC classification number: F41B11/68 , F41B11/723 , F41B11/724
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