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Harold T. Avery, the chief engineer at Marchant company, the inverntor of the fastest mechanical computing mechanism (Silent Speed) was bon on October 24,1892. His calculators were in daily use in many business offices as well as in Los Alamos laboratories when running diffcult computations for the first atomic bomb.
Definite integral and mean value
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Cellatron R43SM - the ultimate calculator. One of the topmost models across various producers. Also one of the last models of mechanical calculators ever
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