N4MW Museum of Code Practice Oscillators

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Realistic catalog number 20-005 "Morse Code Practice Oscillator".  

This is a fairly modern item.  It includes a tone control, a light, phone jack and a simple spring key.  A switch selects tone, light or both.  The unit can be interconnected with another using the screw posts on the end.  An external key can be connected in place of the provided simple one.

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