Levin Adding Machine

This ten-key non-printing manually operated adding machine has a steel and iron frame. The ten digit keys are arranged in two columns on the left side. Two rows of nine keys across the top indicate the place number of the digit entered. The front row is for addition and the other is for subtraction. To enter a number, both the digit key and the place key were depressed. Numbers through 9,999,999 can be indicated. The metal keys have plastic and paper key tops. The space under the keyboard is covered with green velvet. The result is indicated on a row of red number wheels below these two rows of keys. The machine is stored in a small black suitcase covered with leather, lined with cloth, and provided with a metal handle on top.

Compare to U.S. patent 815,542, dated March 20, 1906. Other Levin patents are 706,000, July 29, 1902,and 727,392, May 5, 1903.

Judah Levin, the inventor of this adding machine, was an Orthodox rabbi in Detroit.

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