The difference between Adding machine and Comptometer
When used as nouns, adding machine means a simple mechanical or electromechanical calculator that could only perform simple calculations such as addition or subtraction, whereas comptometer means a mechanical or electromechanical calculator.
check bellow for the other definitions of Adding machine and Comptometer
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Adding machine as a noun:
A simple mechanical or electromechanical calculator that could only perform simple calculations such as addition or subtraction
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Comptometer as a noun:
A mechanical or electromechanical calculator; an adding machine without a crank, driven instead by keypress.