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2. Tuned radio frequency receiver - Wikipedia

   en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

   This 1920s TRF radio manufactured by Signal is constructed on a breadboard Tuning a TRF receiver, like this 5 tube Neutrodyne set from 1924 with two stages of RF amplification, was a complicated process. The three tuned circuits, controlled by the 3 large knobs, had to be tuned in unison to the new station.

3. National Register of Historic Places listings in Lee County ...

   en.wikipedia.org/wiki/National_Register_of...

   Location of Lee County in Florida. This is a list of the National Register of Historic Places listings in Lee County, Florida. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Lee County, Florida, United States. The locations of National Register properties and districts for ...

4. National Register of Historic Places listings in Duval County ...

   en.wikipedia.org/wiki/National_Register_of...

   This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Duval County, Florida, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.

5. National Register of Historic Places listings in Putnam ...

   en.wikipedia.org/wiki/National_Register_of...

   This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Putnam County, Florida, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below may be seen in a map.

6. National Register of Historic Places listings in Hillsborough ...

   en.wikipedia.org/wiki/National_Register_of...

   Location of Hillsborough County in Florida. This is a list of the National Register of Historic Places listings in Hillsborough County, Florida. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Hillsborough County, Florida. The locations of National Register properties and ...

7. National Register of Historic Places listings in Tampa, Florida

   en.wikipedia.org/wiki/National_Register_of...

   Location of Tampa in Hillsborough County, Florida. This is a list of the National Register of Historic Places listings in Tampa, Florida. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Tampa, Florida. The locations of National Register properties and districts for which the ...

8. National Register of Historic Places listings in Clay County ...

   en.wikipedia.org/wiki/National_Register_of...

   This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Clay County, Florida, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.

9. National Register of Historic Places listings in Alachua ...

   en.wikipedia.org/wiki/National_Register_of...

   Location of Alachua County in Florida. This is a list of the National Register of Historic Places listings in Alachua County, Florida. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Alachua County, Florida, United States. The locations of National Register properties and ...