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Improvements in Calculating Apparatus particularly applicable for Problems connected with Textile Trades.
Improvements in Calculating Apparatus particularly applicable for Problems connected with Textile Trades.
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机译:计算设备的改进,特别适用于与纺织品贸易有关的问题。
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摘要
117,278. Bell, A. M. April 10, 1917. Proportional calculators.-A calculating - device particularly applicable for use in solving problems connected with textile industries comprises a board or chart M squared according to the metric system, a pointer N being pivoted at the end O of the base-line O X. A second pointer D may be pivoted at the point X. Each pointer may consist of a celluloid strip upon which a straight line is ruled. Reference has been directed by the Comptroller to Specifications 1665/71, 12434/03, and 13759/15.
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