Kellogg "Candlestick" Microphone
	Kellogg was a major early telephone equipment manufacturer who, like Western Electric, made microphones for non-telephone applications.  This is a fairly common, generic single-button microphone intended for various uses such as public address, radio dispatching, police, and amateur radio.  This dates to the 1920's, and is almost identical in appearance to the Kellogg candlestick style desk phones of the period.  There is a "press to talk" button where the normal hook switch would be.
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