Calculator
Patent for a calculator which consists of semicircular device with movable pointers and number indexes printed on it that allows the pointers to be moved to different numbers to produce the answer to a math problem such as calculating the cost of goods sold by the pound in a store.
Main Author: | |
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Other Authors: | , , , |
Format: | Patent |
Language: | English |
Published: |
United States. Patent Office.
1909
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Subjects: | |
Online Access: | https://texashistory.unt.edu/ark:/67531/metapth512717/ |
Summary: | Patent for a calculator which consists of semicircular device with movable pointers and number indexes printed on it that allows the pointers to be moved to different numbers to produce the answer to a math problem such as calculating the cost of goods sold by the pound in a store. |
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