Friden Model S 10 Calculating Machine

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By 1939 Friden Calculating Machine Company had introduced a “Supermatic” version of its calculating machine that featured multiplication by direct entry of digits (rather than repeated addition). This is an example of that full-keyboard non-printing electric stepped drum machine. It has a metal frame painted gray and ten columns of color-coded gray and blue-green plastic number keys, with a blank green key at the bottom of each column.
Metal rods between the columns of keys turn to indicate decimal places. On the right are two columns of function bars and keys. On the left is a register that indicates numbers entered for multiplication. Below it is a block of 9 white digit keys, with a 0 bar below. These are surrounded by further levers and function keys.
Behind the number keys is a movable carriage with an 11-digit register and a 21-digit result register. The result register has plastic buttons above it that can be used to set up numbers. Zeroing knobs for the registers are on the right of the carriage. Decimal markers slide below the two registers on the carriage. The machine has four hard rubber feet. An electric cord attachs to the machine at the back.
A mark on the bottom of the machine reads: S10-105632. A mark on the back and sides reads: FRIDEN. A sticker attached to the bottom reads: MODEL S. It also reads: FRIDEN CALCULATING MACHINE CO., INC. [() MADE IN SAN LEANDRO, CALIFORNIA, U.S.A. It also reads: DESIGN PAT. 103,425.
Design patent D103,425 was granted to Carl M. Friden March 2, 1937. According to Carl Holm of Neopost, the model S 10 was introduced in 1938. The date given is from Jorgenson.
Ernie Jorgenson, Friden Age List, Office Machine Americana, p. 2.
Currently not on view
date made
Friden Calculating Machine Company, Inc.
place made
United States: California, San Leandro
Physical Description
metal (overall material)
plastic (overall material)
rubber (overall material)
overall: 21.6 cm x 45.7 cm x 33 cm; 8 1/2 in x 18 in x 13 in
ID Number
catalog number
accession number
maker number
S10 105632
Credit Line
Gift of The Singer Company, Friden Division
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Calculating Machines
Data Source
National Museum of American History


"Was fortunate enough to find one of these in a thrift store for $50.00. After the application of a little TLC, 3-in-1 oil, and brute force, not necessarily in that works! Heavy, built like a tank and makes a racket, but gets the job done with many more digits of precision than almost all modern calculators."

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