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| Washington Times, 19-March-1924 |
A test proved that radio could be listened to 500 feet down in a coal mine. In light of yesterday's story about the Castle Gate Mine disaster (https://cablecarguy.blogspot.com/2024/03/175-dead-in-mine-march-8-2024.html), it is interesting that "The test also demonstrated the feasibility of mine rescue work by means of radio.
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