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History of the manufacturer  

Ham Radio Center; St. Louis, Missouri.

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Name: Ham Radio Center; St. Louis, Missouri.    (USA)  
Abbreviation: ham
Products: Model types

Ham Radio Center; St. Louis, Missouri.

Sold ham keys under the brand name "the Ham Key".

Production: 1975 -

This manufacturer was suggested by Gottfried Silberhorn.

Some models:
Country Year Name 1st Tube Notes
USA  75 the Ham Key HK-1   Iambic Paddle; sold with the Ham Key Keyer. 
USA  75–85 Dual HAM Key HK-4   Ham Radio Center Dual HAM Key HK-4.A HK-1 Iambic paddle and a HK-2 straight key mounted on... 
USA  75 HAM-KEY HK-3   Straight key mounted on a steel base.