MANUAL CALCULATING DEVICE
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United States of America Patent
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Issued Date -
Apr 13, 2017
app pub date -
Oct 8, 2015
filing date -
Oct 8, 2015
priority date (Note) -
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Abstract
A manually operable calculating device is provided. The device includes a plurality of rods vertically disposed relative to one another. At least ten rings are slidably disposed on each of the plurality of rods. The at least ten rings include a first set of five rings including a first color and a second set of five rings including a second color. The plurality of rods each include a front surface opposite a rear surface. A plurality of numerals are disposed on the front surface and correspond to the number of rings. The rear surface is unnumbered.
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