Rescue 8 used to be a popular TV series back in the 1950's and was based in Los Angeles, Ca.
I was watching an episode called " the steel Mountain" when at 8:13 thru about 8:25 I was surprised to hear a diaphone going off in the background.
https://www.youtube.com/watch?v=Cwf_R5x0iQk
Diaphone in old TV show episode
Moderator:David