Holding pattern rotary calculator

Details Holding pattern rotary calculator Holding pattern rotary calculator

1990-07-06

1993-08-24

Douglas, Alan P.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03386830

REFERENCES:
patent: D201385 (1965-06-01), Pelletier
patent: D271382 (1983-11-01), Stein
patent: 3136595 (1964-06-01), Holt
patent: 3500413 (1970-03-01), Dohogne
patent: 3589327 (1971-06-01), Jacobs
patent: 3698630 (1972-10-01), Dick et al.
patent: 3835299 (1974-09-01), Turney
patent: 4317404 (1982-03-01), Lombardo
Architectural Record, Oct. 1956, Circular calculating device, p. 308-bottom right.

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