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Model 200A Audio Oscillator, 1939 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/002-product.html
Model 200A audio oscillator, 1939. An audio oscillator is an instrument that generates one pure tone or frequency at a time. Through the years, HP oscillators were used to design, produce and maintain telephones, stereos, radios and other audio equipment. The Model 200A began as the subject of Bill Hewlett's master's thesis at Stanford ...
HP Virtual Museum: Model 200A audio oscillator, 1939 …
https://www.hp.com/hpinfo/abouthp/histnfacts/museum/earlyinstruments/0002/0002history.html
Their initial product was the 200A audio oscillator; It sold for $54.40. Similar equipment built by competitors cost between $200 and $600, a whopping price difference that generated a buzz very quickly. The company's first big sale was an order of eight model 200B audio oscillators to the Walt Disney Company.
HP 200A Manual - HP Archive
http://www.hparchive.com/Manuals/HP-200A-Manual-1951.pdf
The Model 200A Audio Oscillator is a general purpose oscillator which uses the resistance-tuned circuit to generate alternating current voltages from 35 to 35,000 cycles/sec. This audio oscillator provides a source of voltage for amplifier testing, audio response &-Ea~smi4&szBc,.
Audio Oscillator 200A Equipment Hewlett-Packard, HP;
https://www.radiomuseum.org/r/hp_audio_oscillator_200a.html
The 200A audio oscillator of 1939 is the first product of Hewlett Packard (HP). A US patent Nr. 2268872 was granted to W.R. Hewlett in January 6th 1942, filed in July 11th 1939. An audio oscillator is an instrument that generates one pure tone or frequency at a time.
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