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公开(公告)号：US3484821A
公开(公告)日：1969-12-16
申请号：US3484821D
申请日：1968-03-25
Applicant: FORSE HARRY D
Inventor： CAMPBELL ROLLIN E , FORSE HARRY D
CPC classification number: D06F71/34
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公开(公告)号：US3463367A
公开(公告)日：1969-08-26
申请号：US3463367D
申请日：1967-01-23
Applicant: FORSE HARRY D
Inventor： CAMPBELL ROLLIN E , FORSE HARRY D
CPC classification number: D06F71/08
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