The All American Five was a superheterodyne radio receiver designed in the USA in the 1930's. The philosophy behind the design was simple: it had to be as cheap to make as possible. All other considerations were secondary including performance and safety. At least one radio manufacturer preferred to go bankrupt rather than manufacture this set. ...more on Wikipedia about "All American Five"
A communications receiver is a type of radio receiver characterised by its frequency coverage, frequency selection, and range of adjustments to the radio signal. They are more sensitive and more selective than normal shortwave radios. Although they are available as commercial products for ham use, traditionally, it was government or the military that drove the technological advances in this type of set. ...more on Wikipedia about "Communications receiver"
The crystal radio receiver (also known as a crystal set) was first built circa 1900 by Greenleaf Whittier Pickard, who used crystalline minerals to detect radio signals. ...more on Wikipedia about "Crystal radio receiver"
A shower radio is a type of battery-powered radio that is waterproofed to allow it to be used in a bathroom or other wet environment. Some versions also include a CD player and/or a clock. Due to the requirements of the design, shower radios generally lack headphone jacks or AC adapter ports that could short out or electrocute the user. They also tend to lack external antennas for the same reason. ...more on Wikipedia about "Shower radio"
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