The difference between Adding machine and Arithmometer
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 arithmometer means a calculating machine.
check bellow for the other definitions of Adding machine and Arithmometer
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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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Arithmometer as a noun (dated):
A calculating machine.