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公开(公告)号：US3549228A
公开(公告)日：1970-12-22
申请号：US3549228D
申请日：1968-07-26
Applicant: KEYSTONE CONSOLIDATED IND INC
Inventor： ALEKS VYTANT P
IPC: A47B95/02
CPC classification number: A47B95/02 , A47B2095/021
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