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公开(公告)号：US1243686A
公开(公告)日：1917-10-23
申请号：US13872116
申请日：1916-12-26
Applicant: UNIVERSAL PATENTS COMPANY
Inventor： BATCHELDER FRANK R
CPC classification number: F42B39/08
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公开(公告)号：US1268787A
公开(公告)日：1918-06-04
申请号：US13872016
申请日：1916-12-26
Applicant: UNIVERSAL PATENTS COMPANY
Inventor： BATCHELDER FRANK R
CPC classification number: F42B39/08
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