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Man In Office At Adding Machine, Looking At TapeUNITED STATES - CIRCA 1930s 1940s: Man In Office At Adding Machine, Looking At Tape
Adding machinehttp://csaimages.com/images/istockprofile/csa_vector_dsp.jpg
Adding Machinghttp://csaimages.com/images/istockprofile/csa_vector_dsp.jpg
Black and white illustration of a pocket calculator
Digital illustration of green calculator
Illustration of a calculator
Illustration of how a solar-powered calculator works, photon giving energy to an electron in a silicon atom, electron then flies out and joins with others to make electric current
Diagram of astronomical calculator, Ancient Greece
Calculator with fingers and face, calculating