developers (German inventors Josef Engl (18931942 Hans Vogt (18901979 and Joseph Massolle (18891957) and investigating other European sound film systems. Patent 926,933 "Wireless Telegraphy.S. Phonofilm recorded the electrical waveforms produced by a microphone photographically onto film, using parallel lines of variable shades of gray, an approach known as "variable density in contrast to "variable area" systems used by processes such as RCA Photophone. For example, adding the following code snippet into html head tag will help to represent this web page correctly in social networks: Share this report in social media Analyze another website. Patent 926,935 "Wireless Telegraph Transmitter filed February 1906, issued July 1909;.S. However, de Forest had a falling out with both men. In 1934, he established a small shop to produce diathermy machines, and, in a 1942 interview, still hoped "to make at least one more great invention". Our system also found out that m main pages claimed encoding. At this time the American Telephone and Telegraph Company was researching ways to amplify telephone signals to provide better long-distance service, and it was recognized that de Forest's device had potential as a telephone line repeater. The Saga of the Vacuum Tube. Mayes, 1989, page. His most famous invention, in 1906, was the three-element ". Butler, located in the Fox's Dock Pavilion on South Bass Island. Radio communications firm, albeit propped up by massive stock fraud, until its bankruptcy in 1912. Citation needed In his autobiography, he wrote that in the summer of 1894 there was an important shift in his beliefs: "Through that Freshman vacation at Yale I became more of a philosopher than I have ever since.