Looking for old laws (1930's) regarding the mobile use of radios in automobiles

[John Bolduc]

Hello

I'm looking for sources of old laws (1930's or so) regarding the mobile
use of radios in automobiles. If I recall some of the first car radios met
with the scrutiny of lawmakers and police.

This is also a stretch, but with some of the old radios being capable of
hearing the local police just above the AM broadcast band, were there any
laws regarding having this capability in an automobile.

Thanks
John
Derry NH