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公开(公告)号：US3540416A
公开(公告)日：1970-11-17
申请号：US3540416D
申请日：1969-01-06
Applicant: BABSON BROS CO
Inventor： SHULICK ROBERT J , SWANSON HAROLD V
IPC: A01J5/10
CPC classification number: A01J5/10
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