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The Museum of HP Calculators
This is an online museum offering extensive, illustrated documentation of almost every electronic calculator made by Hewlett-Packard (HP) since the mid-1960s. There are forums, a classified section, a history of early calculation machines (such as the slide rule), and other information for collectors of early computing technology. Created by a collector who is not affiliated with HP.
http://www.hpmuseum.org
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