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公开(公告)号：US3139171A
公开(公告)日：1964-06-30
申请号：US21835862
申请日：1962-08-21
Applicant: AJEM LAB INC
Inventor： EMIL UMBRICHT , BURMAN WILLIAM J
IPC: B65G25/00
CPC classification number: B65G25/02
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