Dr.Jon
Member
Thank you!!!Federal Signal PA-1, 1958
This thread provides a great starting point for equipment timelines: https://elightbars.org/forums/threads/timeline-of-equipment.79727/
I believe that refers to this, unless they had an even earlier versionThe first siren may be the Penetrator that was advertised as the world's first transistor siren. It is not clear who the manufacturer is, but it was sold by George F. Cake Co., who sold equipment.
View attachment 248008