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The Green Bullet mic, also known as the model 520, was introduced in mid 1949 by Shure Brothers Inc. of Chicago, Illinois. It was intended for use as a high quality, moderately priced microphone to be used mainly as a communications, recording, and public address microphone. It became popular with ham radio operators as well as commercial use as a dispatch mic for police, fire, and other commercial dispatch uses, as well as military use. The mic was tailored for good speech response, and was made to withstand temperature extremes, and to be practically moisture proof. It is unaffected by weather extremes and salt spray making an ideal choice for coastal areas.