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公开(公告)号：US1468194A
公开(公告)日：1923-09-18
申请号：US56768622
申请日：1922-06-12
Applicant: CARLSON ERNEST H
Inventor： CARLSON ERNEST H
IPC: A01B63/04
CPC classification number: A01B63/04 , Y10T74/20396
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公开(公告)号：US2125152A
公开(公告)日：1938-07-26
申请号：US6843536
申请日：1936-03-12
Applicant: CARLSON ERNEST H
Inventor： CARLSON ERNEST H
IPC: E05D13/00
CPC classification number: E05D13/10 , E05Y2201/654 , E05Y2600/46 , Y10T16/665 , Y10T403/4974
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