Uploaded June 2022 | Updated September 2026, 2 hours ago

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The Precise adding machine is a simple co-axial adder with a built-in stylus. It was made between 1946 and 1950 in Chicago, and despite its short production period it has a rather complicated history.

For more information about this and other calculating machines in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:27 Addition
0:54 Clearing
1:22 History
1:41 Precise Developments Co.
2:54 E.C.A.
5:25 Tastee-Freez
7:01 Outro