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公开(公告)号：US3267748A
公开(公告)日：1966-08-23
申请号：US21168862
申请日：1962-07-23
Applicant: MARTIN MARIETTA CORP
Inventor： CONKLIN JR CLEMENT L
IPC: G01C19/02
CPC classification number: G01C19/025 , Y10T74/12 , Y10T74/1207 , Y10T74/1282
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