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Crystal Radios - R |
 
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Radio Maintenance Company
A 1920s crystal radio made by Radio Maintenance Company (R.M.C.) in Minneapolis, at 31st and Snelling Avenue.
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RAO 'Double-Slider'
A 1920s crystal radio made by RAO Manufacturing Company in Minneapolis.
This example has two knobs on top that move up and down to tune hidden slider contacts inside the coil. The radio is stamped 'RAO' into the wood on the bottom.
Another variation of this radio has a large label on top calling it a 'Hidden Coil' and only has one internal
slider.
RAO Manufacturing Company still exists and is now located in Fridley, Minnesota.
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Rippner 'Monarch Radio Set'
A 1920s crystal radio made by The Rippner Bros. Mfg. Co., Cleveland, Ohio. This one has the rarer deep blue color can.
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Ritter Grand Crystal Set
A 1920s crystal radio made by Ritter Radio Corporation at 232 Canal Street in New York City.
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