Uploaded August 2022 | Updated September 2026, 1 hour ago

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The Summira S is a version of the Summira 7 adding machine but with a printer mechanism at the back. Pulling the large handle will cause the current input to be printed, either in black or in red depending on whether subtraction mode is selected.

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

0:00 Introduction
0:19 Addition
1:02 Clearing
1:32 Multiplication
2:23 Subtraction
3:28 Printing
6:20 Printing mechanism
8:06 History
8:34 Outro