1931

Arlington Mass got radios in 1931

https://drive.google.com/file/d/1wWvfb_GcPXsLxMVx_oXloKYggaibHQph/view?usp=sharing

first police agency in New England with radios ... got fcc license 'wped' on Dec 15 1931 ... used 1,712 kilocycles with 50 watts of power

also had a biplane

and had blinking callboxes that signalled fire box numbers... bells and horns were phased out

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https://arlington.advantage-preservation.com/viewer/?k=seagrave&i=f&d=01011871-12312005&m=between&ord=k1&fn=arlington_advocate_usa_massachusetts_arlington_19310703_english_9&df=21&dt=30

1913 Knox at Central will become reserve engine