1 Matching Results
Results open in a new window/tab.
Results:
1 - 1 of
1
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.
Date:
December 21, 1909
Creator:
Goss, George Wilson
System:
The Portal to Texas History