"In the 1930's, most police communication took place between 1500 and 2500 Khz."
These were one-way broadcasts. The 30mHz 2-ways, although under
development and testing that early, were still experimental. It
appears that 1934 marked the beginning of two-way when the license
W2XAT was issued to the New Rochelle, NY police on 60 mHz.
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per https://groups.google.com/g/ba.broadcast/c/wWZdBh_417E/m/AvcCOYSb4F4J?pli=1
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