国立アメリカ歴史博物館のインスタグラム(amhistorymuseum) - 4月16日 05時18分

Imagine doing your taxes with Mudd’s Tax Calculator, 1879. ?

Robert Levin Mudd, a county clerk in Bond County, Illinois, received a patent for this tax calculator. It has sliding tables for calculating the tax on a property worth up to $10,000. The device is made of wood, metal, leather, and paper, and it folds up and fits into a wooden case for easy carrying.
#TaxDay #MobileTech

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