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Related to Arithmometer: Comptometer
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and the [gamma] arithmometer (DFM-96) used was produced by Hefei Zhongcheng Electromechanical Technology Exploration Co.
the Thomas arithmometer achieved little popularity, and most accounting computations continued to be performed manually.
The museum's exhibits range from a clay cuneiform tablet to an arithmometer (a mechanical calculator) and an Apollo Moon Mission guidance computer.