Sinclair President
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The Sinclair President is a calculator that was made by Sinclair Research Ltd. It was launched in 1978. Writing embossed in the black platic of the back of the calculater state that they were assembled in Hong Kong and designed in Great Britain.
It requires two size AA 1.5 volt batteries or it can by powered by a 3 volt DC external adapter via a socket on the side of the calculator.
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