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Technologies that were never successfully developed, may have disappeared completely. [2] These are not contained in the following list. Also not included are spurious inventions - technologies which are generally considered to not possess their claimed capabilities, to be hoaxes, or to not have ever existed in the first place.
REL owes its existence to the demands of General Andrew McNaughton, who was concerned about a lack of optical equipment after the Canadian experience in World War I.. In August 1939, General Andrew McNaughton, President of the National Research Council (NRC), asked the head of the NRC's Optics Section, Leslie E. Howlett, to prepare a report on how to set up an optics industry in Canada.
They were convenient, though the prices were initially high and the sound quality of early models was not nearly as good as tube radios. Later models equalled or surpassed tube models in audio quality. Transistors also made it possible to manufacture portable FM radios, which was impractical using tubes.
As the gaps made and broke contact, the radio wave was audible as a tone in a crystal set. The telegraph key often directly made and broke the 2000 volt supply. One side of the spark gap was directly connected to the antenna. Receivers with thermionic valves became commonplace before spark-gap transmitters were replaced by continuous wave ...
Craftsman is a line of tools, lawn and garden equipment, and work wear.Originally a house brand established by Sears, the brand is now owned by Stanley Black & Decker.. As with all Sears products, Craftsman tools were not manufactured by Sears during the company's ownership, but made under contract by various other companies.
Some subsidiaries were sold, including Harley-Davidson in 1981. For a time, the Italian scuba diving equipment manufacturer Mares was part of AMF, and was able to secure the rights to the MR-12 regulator, previously made by Voit, and to continue manufacture of the regulator. Mares would revert to being an independent manufacturer after AMF was ...
The Galion Iron Works Company of Galion, Ohio, was founded by David Charles Boyd and his three brothers in 1907.In its early years, the Galion produced a wide range of road-building and other construction equipment, such as drag scrapers, plows, wagons, stone unloaders, rock crushers, and a variety of other "experimental machines".
The Rhodesian Security Forces were equipped with a mix of Western-made weapon systems from World War II and more modern military equipment, mainly British in origin, but also included Portuguese, Spanish, French, Belgian, West German, American, Brazilian and South African military hardware.