Printing and office machinery – Typewriter or calculator – Calculator
Patent
1992-03-02
1994-10-11
Douglas, Alan P.
Printing and office machinery
Typewriter or calculator
Calculator
Patent
active
D03514030
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The "ShopCal" brochure.
Visual Merchandizing and Store Design, May 1989, p. 63.
Ewert John P.
Hood Charles H.
ADDvantage Media Group, Inc.
Douglas Alan P.
Spear Robert M.
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