National Model 11EN Adding Machine

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This full-keyboard listing electric adding machine has a gray metal frame and ten columns of green and white color-coded plastic keys. Behind the light green keyboard is a row of ten number dials. Right of the keyboard are square keys (and an addition bar). The”*” key is for totaling, the S for subtotals, the “-” for subtraction, the “+” for addition, and the “#” for non-add. The “C” is on a clearance key. The machine prints these symbols, except in the cases of addition and clearance. Subtracted numbers are in red. There also is a repeat lever. Behind the keyboard and the dials to the left is a lever controlling the printing mechanism. This mechanism and the narrow paper tape, fixed carriage, and motor are at the back. There appear to be 11 keys in the printing mechanism, one for a symbol and the other for digits.
The machine is marked on the front: ALLEN WALES. It is marked on a metal tag at the base of the front: 11EN272043. It is marked on the back of the machine: MANUFACTURED AT (/) ITHACA, NEW YORK, U.S.A. BY THE (/) ALLEN-WALES ADDING MACHINE DIVISION OF (/) THE NATIONAL CASH REGISTER COMPANY (/) DAYTON, OHIO. U.S.A. (/) ALLEN-WALES. It is marked on a tag at the base of the back: ALLEN WALES MODEL E.
This is model #304 from the Patent Division of Burroughs Corporation.
Compare to 1986.0397.01.
American Office Machines Research Service, section 3.21, 1938, p. 4.
Currently not on view
date made
Allen Wales Adding Machine Division, the National Cash Register Company
place made
United States: New York, Ithaca
Physical Description
paper (overall material)
plastic (overall material)
metal (overall material)
rubber (overall material)
overall: 20.4 cm x 26.5 cm x 43 cm; 8 1/32 in x 10 7/16 in x 16 15/16 in
ID Number
catalog number
accession number
Credit Line
Gift of Burroughs Corporation
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History


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