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公开(公告)号：US2489978A
公开(公告)日：1949-11-29
申请号：US72920847
申请日：1947-02-18
Applicant: DRAPER CORP
Inventor： ROGERS LEONARD M , FRANCIS DONOGHUE FLORENCE
IPC: D03D49/62
CPC classification number: D03D49/62
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公开(公告)号：US2556136A
公开(公告)日：1951-06-05
申请号：US1192148
申请日：1948-02-28
Applicant: DRAPER CORP
Inventor： FRANCIS DONOGHUE FLORENCE
IPC: D03D51/34
CPC classification number: D03D51/34 , D03D2700/316
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