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公开(公告)号：US3107285A
公开(公告)日：1963-10-15
申请号：US3640060
申请日：1960-06-15
Applicant: NAT COMPANY INC
Inventor： GUENTHER KNAPP
IPC: G05D23/24
CPC classification number: G05D23/24 , G05D23/1913
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