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Fire Bottles: The 1928 RCA Radiola 18 and the Tuned Radio Frequency Design | https://frrl.wordpress.com
File:Radiola Superheterodyne Radio Receiver with Loop Antenna and speaker horn, Rca, 1924 - National Electronics Museum - DSC00052.JPG - Wikimedia Commons
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Fire Bottles: The 1928 RCA Radiola 18 and the Tuned Radio Frequency Design | https://frrl.wordpress.com
![File:Vintage RCA Radiola Semi-Portable Radio, Model AR-812, Broadcast Band Only (MW), Battery Powered, 6 UV199 Vacuum Tubes, Paired With A Radiola Model 100 Speaker, Circa 1924 (14782561019).jpg - Wikimedia Commons File:Vintage RCA Radiola Semi-Portable Radio, Model AR-812, Broadcast Band Only (MW), Battery Powered, 6 UV199 Vacuum Tubes, Paired With A Radiola Model 100 Speaker, Circa 1924 (14782561019).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/7/76/Vintage_RCA_Radiola_Semi-Portable_Radio%2C_Model_AR-812%2C_Broadcast_Band_Only_%28MW%29%2C_Battery_Powered%2C_6_UV199_Vacuum_Tubes%2C_Paired_With_A_Radiola_Model_100_Speaker%2C_Circa_1924_%2814782561019%29.jpg)