Felsenthal Instruments Computer Attack CPU73A

The Computer Attack CPU73A was fabricated in the United States by Felsenthal Instruments Co. during the late 1960's and early 1970's. Fabricated with plastic materials like Polyolefin and Vinyl Chloride, this double sided circular rule was produced for the US Air Force, as and aide for pilots to solve time, speed and distance, as well as true airspeed problems.

Felsenthal Instruments was founded in 1898 with the name G. Felsenthal & Co. and was initially devoted to the wholesale of novelties, that ranged from decorative dove taxidermy, “spangle belts,” wall-mounted match scratchers, telephone name plates, and papier-mache Santa Clauses. In 1899, G. Felsenthal & Co. got into camera production, and ten year later they moved to the Magic Moving Pictures postcards production. which utilized a 1906 line-screen animation patent by Alexander S. Spiegel, a sort of first-wave hologram, bringing three separate images together on one miniature handheld “screen.” (1). In 1921 established a factory for the production of pens, candy bar holders, tape measures, vanity cases, paper weights and other “celluloid specialties” . During the Great depressions years the company focused on injection molded auto parts, industrial name plates, and other stuff less likely to be promoted to the general public.

References:

(1). Made in Chicago Museum: G.E. Felsenthal & Sons, est 1898. https://www.madeinchicagomuseum.com/single-post/g-felsenthal/