National Model 11EN Adding Machine

This full-keyboard printing electric adding machine has a gray metal frame and ten columns of green and white color-coded plastic keys. Behind the keyboard is a row of ten number dials. Right of the keyboard are square keys (and an addition bar) marked with a star (for totaling), an S (for subtotals), a subtraction sign, an addition sign, and a “#” (for non-add). The machine prints these symbols, except in the case of addition. 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.
The machine is marked on the front: National. It is marked on a metal tag at the base of the front: 11EN327988. It is marked on the back: 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. (/) National. It is marked on a tag at the base of the back: NATIONAL SERIES E.
The stand for this machine is 1986.0397.02. Compare 1982.0794.79.
American Office Machines Research Service, section 3.21, 1938, p. 4.
Currently not on view
Object Name
adding machine
date made
Allen Wales Adding Machine Division, the National Cash Register Company
Physical Description
paper (overall material)
plastic (overall material)
metal (overall material)
rubber (overall material)
overall: 21 cm x 30 cm x 47 cm; 8 9/32 in x 11 13/16 in x 18 1/2 in
place made
United States: New York, Ithaca
ID Number
catalog number
accession number
Science & Mathematics
Adding Machines
See more items in
Medicine and Science: Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of National Engineering Products, Inc.
Additional Media

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