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公开(公告)号:US2629308A
公开(公告)日:1953-02-24
申请号:US13820750
申请日:1950-01-12
Applicant: DEARBORN MOTORS CORP
Inventor: FREVIK RALPH C
IPC: A01B15/06
CPC classification number: A01B15/06
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公开(公告)号:US2653824A
公开(公告)日:1953-09-29
申请号:US25025151
申请日:1951-10-08
Applicant: DEARBORN MOTORS CORP
Inventor: FREVIK RALPH C
IPC: A01B59/042
CPC classification number: A01B59/042
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公开(公告)号:US2626555A
公开(公告)日:1953-01-27
申请号:US13688450
申请日:1950-01-05
Applicant: DEARBORN MOTORS CORP
Inventor: FREVIK RALPH C
IPC: A01B15/06
CPC classification number: A01B15/06
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公开(公告)号:US2672082A
公开(公告)日:1954-03-16
申请号:US24454651
申请日:1951-08-31
Applicant: DEARBORN MOTORS CORP
Inventor: FREVIK RALPH C
IPC: A01B59/06
CPC classification number: A01B59/065 , Y10T74/18856
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公开(公告)号:US2624258A
公开(公告)日:1953-01-06
申请号:US13494549
申请日:1949-12-24
Applicant: DEARBORN MOTORS CORP
Inventor: FREVIK RALPH C
IPC: A01B15/16
CPC classification number: A01B15/16
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6.Method of determining soil pressures produced on the soil working surfaces of ground engaging tools 失效
Title translation: 确定地面接合工具土壤工作面土壤压力的方法公开(公告)号:US2601776A
公开(公告)日:1952-07-01
申请号:US11403549
申请日:1949-09-03
Applicant: DEARBORN MOTORS CORP
Inventor: FREVIK RALPH C
CPC classification number: G01L5/0061 , G01L1/005
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