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on 07 Apr 1989
Sigma Data Computing Corp.
73323972 · 17 Aug 1981
009
Pre-Recorded Computer Programs in the Form of Magnetic Tapes and Discs...
on 09 Mar 1989
Sigma Data Computing Corp.
73324057 · 17 Aug 1981
016
Manuals for Computerized Information Storage and Retrieval System,Manu...
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