Friden Model STW 10 Calculating Machine

This full-keyboard, electric non-printing stepped drum calculating machine has a metal frame painted gray-green and ten columns of gray and tan plastic number keys, with a blank gray key at the bottom of each column. The three rightmost columns are gray, the next three tan, the next three gray, and the leftmost tan. Metal rods between the columns of keys and beneath the keyboard turn to indicate decimal places. The capabilities of the Friden STW-10 are quite similar to those of the earlier ST-10, although the exterior design and color are different.
On the right are two columns of function bars. On the left is a nine-digit register that indicates numbers entered for multiplication. Below it is a block of nine gray 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 revolution register and a 20-digit result register. Plastic buttons above the result register serve to set up numbers. There are ten numbered buttons under the revolution register as well. Zeroing knobs for the registers are on the right of the carriage. Registers on the carriage have sliding decimal markers and turning decimal dividers between columns of keys. The case has no streamlines.
The machine has a cord and cover. It is marked: STW 10 443523. A mark on the cover reads: Friden Automatic Calculator.
Compare to MA.334379 and MA.335419.
The date given is based on the serial number, courtesy of Carl Holm. This is the date of manufacture. The date from Ernie Jorgenson would be 1950.
This is one of five Friden calculating machines given to the Smithsonian by Vincent L. Corrado (1917-1984), a native of Covington, Kentucky who earned bachelor’s and master’s degrees in accounting at Catholic University, served in the U.S. Army from 1942 through 1973, and then joined the Veterans Administration for the rest of his life.
Ernie Jorgenson, Friden Age List, Office Machine Americana, p. 5.
Carl Holm, “Milestones in the Development of Friden.”
Currently not on view
date made
Friden, Inc.
place made
United States: California, San Leandro
Physical Description
metal (overall material)
rubber (overall material)
plastic (overall material)
overall: 22 cm x 45.3 cm x 36.5 cm; 8 21/32 in x 17 27/32 in x 14 3/8 in
overall: 39 in x 39 in x 24 in; 99.06 cm x 99.06 cm x 60.96 cm
ID Number
nonaccession number
maker number
STW 10 443523
catalog number
Credit Line
Gift of Vincent L. Corrado
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Calculating Machines
Data Source
National Museum of American History


I own such a machine. Does anyone know other museums where such items would be welcomed as donations?

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