AMERICAN MARCONI -  5 kw  KEY 
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This (type?) 5 kw auxiliary hand key was rated at 50 amps at 250 Volts  It was built for the War Department Signal Corps in 1917.  Click on image to enlarge. It was one of the largest and heaviest keys made by American Marconi. and was mounted on a slate base. (Source: Kreuzer collection)

 


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July 7/20