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By the 1930s, the broadcast receiver had become a common household item, with standardized controls that anyone could use. [85] The invention of the transistor in 1947 again revolutionized radio technology, making truly portable receivers possible, beginning with transistor radios in the late 1950s. [86]
On September 16, 1930, Lehberger was issued U.S. patent #1,775,861. [232] 1930 Car audio. Car audio/video (car AV) is a sound or video system fitted in an automobile. In 1930, the Galvin Corporation introduced the first commercial car radio, the Motorola model 5T71, which sold for between $110 and $130 and could be installed in most popular ...
The following articles cover the timeline of United States inventions: Timeline of United States inventions (before 1890), before the turn of the century; Timeline of United States inventions (1890–1945), before World War II; Timeline of United States inventions (1946–1991), during the Cold War
When you think of a vending machine, things like snacks, sodas or even pharmaceutical supplies could come to mind. But you might be surprised to know that the first ever vending machine actually ...
The timeline of historic inventions is a chronological list of particularly significant technological inventions and their inventors, where known. [ a ] The dates in this article make frequent use of the units mya and kya , which refer to millions and thousands of years ago, respectively.
1990s United States: Anonymous/protected computer networking Used by journalists, political activists, scientists, etc. Nuclear technology: 1940s United States. United Kingdom Canada (Manhattan Project) Nuclear weapons: Nuclear medicine, nuclear power: Jet engine: 1940s Nazi Germany (Hans von Ohain) United Kingdom (Frank Whittle) Jet fighters ...
This follows since the 1930s, several improvements to the manufacturing technology. The company Ampex introduces the "VR 1000" the first video recorder. That same year, CBS uses it for the first magnetic video tape recording (VTR) from. Although other programs are produced in color since 1954, the VTR cannot record color.
Primitive digital cameras become commercially available by 1989/1990 and slowly become more affordable and appealing; mostly replacing traditional film by 2007. PDAs (Personal Digital Assistants) become popular in the mid-1990s with the release of the touchscreen Apple Newton in 1993, although it has a monochrome screen.