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公开(公告)号：US2208435A
公开(公告)日：1940-07-16
申请号：US27025739
申请日：1939-04-26
Applicant: SIMPSON ALBERT E
Inventor： SIMPSON ALBERT E
IPC: G01C11/00
CPC classification number: G01C11/00
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公开(公告)号：US1471866A
公开(公告)日：1923-10-23
申请号：US45894921
申请日：1921-04-06
Applicant: SIMPSON ALBERT E
Inventor： SIMPSON ALBERT E
IPC: B23B51/10
CPC classification number: B23B51/108 , Y10T408/33 , Y10T408/906 , Y10T408/9065 , Y10T408/96
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