Electronic calculator for feet-inch-fraction numerics

Registers – Transfer mechanism – Traveling pawl

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Details

235154, G06F 302

Patent

active

039731138

ABSTRACT:
An apparatus is disclosed for automatically adding, subtracting, multiplying and dividing feet, inches and fractions of an inch and for the recordation of the results of said arithmetic functions on a visual display. The apparatus also automatically and directly converts feet, inches and fractions of an inch into decimal equivalents and into the metric system of measurement and, similarly, converts numbers in decimal numeric and in metric measurement automatically and directly into feet, inches and fractions of an inch.

REFERENCES:
patent: 3654449 (1972-04-01), Boyce
patent: 3739161 (1973-06-01), Gross et al.
patent: 3809872 (1974-05-01), Yamamura et al.
patent: 3816731 (1974-06-01), Jennings et al.

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