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公开(公告)号：US1068497A
公开(公告)日：1913-07-29
申请号：US1907400304
申请日：1907-11-01
Applicant: GRAVES AND GRAVES COMPANY
Inventor： GRAVES ERNEST W
CPC classification number: A01G23/12
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公开(公告)号：US906742A
公开(公告)日：1908-12-15
申请号：US1908447826
申请日：1908-08-10
Applicant: GRAVES AND GRAVES COMPANY
Inventor： ROBERTS HENRY P
CPC classification number: A47L1/08
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