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公开(公告)号：US2689019A
公开(公告)日：1954-09-14
申请号：US12386649
申请日：1949-10-27
Applicant: RESEARCH CORP
Inventor： ROBERTS LAWRENCE M , CROWDER ALEXANDER N , SAMUEL RABKIN
CPC classification number: D21C11/066 , B03C3/017 , B03C3/08 , B03C3/41 , B03C3/47 , B03C3/76 , B03C3/88 , B03C2201/04
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公开(公告)号：US2672946A
公开(公告)日：1954-03-23
申请号：US19918450
申请日：1950-12-05
Applicant: RESEARCH CORP
Inventor： SAMUEL RABKIN , CROWDER ALEXANDER N
IPC: B03C3/88
CPC classification number: B03C3/88
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