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Vintage Calculator Web Museum
A virtual museum illustrating and describing "the evolution from mechanical calculator to pocket electronic calculator," covering the late 19th century through 1980. Presents "a selection of hand-operated and electro-mechanical calculators, both desktop and hand-held" (such as the Golden Gem chain adder and the dial stylus Addometer), electronic desktop calculators from the 1960s and 1970s (based on vacuum tubes and transistors), and vintage hand-held calculators, including early programmable calculators form Texas Instruments. From an enthusiast.
http://www.vintagecalculators.com/
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