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2. Transistor radio - Wikipedia

   en.wikipedia.org/wiki/Transistor_radio

   A transistor radio is a small portable radio receiver that uses transistor -based circuitry. Following the invention of the transistor in 1947—which revolutionized the field of consumer electronics by introducing small but powerful, convenient hand-held devices—the Regency TR-1 was released in 1954 becoming the first commercial transistor ...

3. Radio receiver - Wikipedia

   en.wikipedia.org/wiki/Radio_receiver

   A portable battery-powered AM/FM broadcast receiver, used to listen to audio broadcast by local radio stations. A modern communications receiver, used in two-way radio communication stations to talk with remote locations by shortwave radio. Girl listening to vacuum tube console radio in the 1940s.

4. Sony Watchman - Wikipedia

   en.wikipedia.org/wiki/Sony_Watchman

   Sony Watchman. The Sony Watchman is a line of portable pocket televisions trademarked and produced by Sony. The line was introduced in 1982 [ 1] and discontinued in 2000. Its name came from a portmanteau formed of "Watch" (watching television) and "man" from Sony's Walkman personal cassette audio players. There were more than 65 models of the ...

5. Trans-Oceanic - Wikipedia

   en.wikipedia.org/wiki/Trans-Oceanic

   A Trans-Oceanic model Y600. Shown on the left is a modern shortwave radio for comparison. The Trans-Oceanic (abbreviated T/O) was a brand of portable radios produced from 1941 to 1981 by Zenith Radio. They were characterized by heavy-duty, high-quality construction and their performance as shortwave receivers. [ 1][ 2]

6. AM broadcasting - Wikipedia

   en.wikipedia.org/wiki/AM_broadcasting

   AM broadcasting. AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.

7. Walkman - Wikipedia

   en.wikipedia.org/wiki/Walkman

   A major component of the Walkman advertising campaign was overspecialization of the device. Prior to the Walkman, the common device for portable music was the portable radio, which could only offer listeners standard music broadcasts. [34] Having the ability to customize a playlist was a new and exciting revolution in music consumption.