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A calculator designed by Clive Sinclair's famous English brand for
cars, computers and calculators.
The Sinclair Oxford 150 belongs to a series of calculators that include the Sinclair Oxford 100, 150, 200, 300 and the Sinclair Oxford Scientific.
This one is a basic calculator with square roots and percentages.
This calculator thinks √-9=3.
Thank your, Arnoud Helmantel, for finding this one on a flea market!
©2009 Ernst Mulder