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Contex Adder Machine

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ContexTop"Contex" Half-keyboard Adder, Model A, S/N 73053


Despite its appearance, the Contex Adder does not operate in base five. This machine uses half of a keyboard in order to simplify its internal mechanism. To add with numbers greater than five, one must use addition(to get 7, add 5 and 2, ect.).



ContexTop"Contex" Model 10, S/N 434 005 097;




ContexTop""Contex" Half-keyboard Adder, Model A, S/N 131698; Source: John Wolff's Web Museum




ContexTop"Contex" Half-keyboard Adder, Model B, S/N 911428; Source: John Wolff's Web Museum


Visit John Wolff's Web Museum to learn more about the different models of Contex Calculators.



ContexFrontFront of the Model A Adder




ContexLogoLogo on the back of the Model A Adder




ContexBottomWriting on the bottom of the Model A Adder




ContexBottomFront of Model 10 Adder




ContexBottomBack of Model 10 Adder




ContexBottomWriting on the bottom of the Model 10 Adder




Also check out the Monroe 'Mini' Model L.
Retro Calculator Logo -- Retro Calculators Mechanical Adding Machines and Mechanical Adders
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