SinclairExecutive-01
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Na Commons przeniesiono z en.wikipedia.
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Sinclair Executive calculator.
Clever design of its electronics to reduce the power consumption allowed the use of button cells for the first time in a hand-held calculator, and gave a very thin design which was remarkable for the time.
Photograph taken by myself of a calculator in my collection.
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Creative Commons Attribution-Share Alike 3.0
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