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公开(公告)号：US3331532A
公开(公告)日：1967-07-18
申请号：US56918966
申请日：1966-08-01
Applicant: STANFORD RESEARCH INST
Inventor： TATSU HORI
IPC: A01C7/04
CPC classification number: A01C7/048 , Y10S111/903
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