This is one of a series of adding machines and adding machine models prepared by the Patent Department of the Burroughs Adding Machine Company. It is a steel mechanism for part of a key-driven adding machine. There are a one column of nine octagonal white plastic keys and two numeral wheels with black plastic rim. Keys for odd digits are concave, and for even digits, flat. Complementary digits are indicated on the keys. According to the accession file, this is an invention of Walter J. Pasinski. It compels a full stroke on keys.
A metal tag attached to the object reads: B.A.M.CO. (/) MODEL (/) No. 903.
Objects 1982.0794.04 through 1982.0794.10 received together as Burroughs Patent model 42.
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