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Model K - George Stibitz
A simple demonstration circuit which provided proof of concept for applying Boolean logic to the design of computers. -
The HP 200A Audio Oscillator - D. Parkard and B. Hewlett
First founded their company in a California garage where they created the HP 200A Audio Oscillator. The Audio Oscillator was soon purchased by Walt Disney for testing recording equipment and speaker systems. -
Z3 Computer - Konrad Zuse
The Z3 was created for aerodynamic calculations and uses 2,300 relays and performs binary arithmetic. -
The Complex Number Calculator (CNC) - George Stibitz
Designed by George Stibitz, he completes this calculator and demonstrates to an American Mathematical Society conference. -
The Atanasoff-Berry Computer (ABC) - John Vincent Atanasoff
Received funds to build a full scale machine it was the center of a patent dispute to the invention of the computer. The ABC was discredited in 1942 as the concept of computers was declared un-patentable.