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公开(公告)号:US2170773A
公开(公告)日:1939-08-22
申请号:US26595439
申请日:1939-04-04
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J5/00
CPC classification number: D03J5/00 , D03J2700/12
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公开(公告)号:US1951600A
公开(公告)日:1934-03-20
申请号:US65234533
申请日:1933-01-18
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J1/22
CPC classification number: D03J1/226
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公开(公告)号:US2046289A
公开(公告)日:1936-06-30
申请号:US6089936
申请日:1936-01-27
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J1/22
CPC classification number: D03J1/22
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公开(公告)号:US1937081A
公开(公告)日:1933-11-28
申请号:US66988133
申请日:1933-05-08
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J1/22
CPC classification number: D03J1/226
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公开(公告)号:US1893734A
公开(公告)日:1933-01-10
申请号:US60476732
申请日:1932-04-12
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J1/22
CPC classification number: D03J1/226
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公开(公告)号:US2139446A
公开(公告)日:1938-12-06
申请号:US22517638
申请日:1938-08-16
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03D49/38
CPC classification number: D03D49/38 , Y10T403/32426
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公开(公告)号:US2059169A
公开(公告)日:1936-10-27
申请号:US7975436
申请日:1936-05-14
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J1/22
CPC classification number: D03J1/22
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公开(公告)号:US1812087A
公开(公告)日:1931-06-30
申请号:US45235930
申请日:1930-05-14
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J5/00
CPC classification number: D03J5/00 , D03J2700/12
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公开(公告)号:US2100688A
公开(公告)日:1937-11-30
申请号:US15777637
申请日:1937-08-12
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J5/08
CPC classification number: D03J5/08
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公开(公告)号:US1919146A
公开(公告)日:1933-07-18
申请号:US65596133
申请日:1933-02-09
Applicant: DRAPER CORP
Inventor: DOUGLAS FREDRIC E
IPC: D03J1/22
CPC classification number: D03J1/226
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