History of the manufacturer
Natrometer Corporation; Washington D.C.
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Both will display your name after an officer has activated your content, and will be displayed under «Further details ...» plus the text also in the forum.
| Name: | Natrometer Corporation; Washington D.C. (USA) |
| Abbreviation: | natrometer |
| Products: | Others |
| Summary: |
Natrometer Corporation Manufactured the "Natrometer" code practice device used by the National Radio Institute (NRI) starting around 1920 and continuing through the 1920's. |
| History: |
This manufacturer was suggested by Gary Berg.
Some models:
| Country | Year | Name | 1st Tube | Notes |
|---|---|---|---|---|
| USA | 22 | Natrometer Model C | A Morse Code training instrument using a spring drive motor. Made for the National Radio I... |
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| Data Compliance | More Information |