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公开(公告)号：US2643607A
公开(公告)日：1953-06-30
申请号：US14217850
申请日：1950-02-03
Applicant: DITTO INC
Inventor： LEVIN CARL A , SMITH ORED L
IPC: B41L7/08
CPC classification number: B41L7/08
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公开(公告)号：US2718181A
公开(公告)日：1955-09-20
申请号：US24666951
申请日：1951-09-14
Applicant: DITTO INC
Inventor： GULLIXSON HAROLD R , SMITH ORED L
IPC: G03B27/02
CPC classification number: G03B27/02
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