Wed Jul 15, 2020 9:16 pm
UPDATE: I found an old newspaper clipping about the first test of a thunderbolt prototype in Minneapolis, MN on January 11th, 1952. The article details how it worked and the people that were testing it, and a description of it being tested.
I've attached a screenshot of the page below, you can see a picture of the prototype being tested in the upper right hand corner.
-
Attachments
-

- thunderboltprototypenewspaper.png (181.29 KiB) Viewed 3131 times
Very proud owner of a Federal Signal Thunderbolt 1000A, a Federal Sign & Signal Model D, a Federal Sign & Signal STH-10B, and two Federal Signal IC-S2S4s (5 & 13 Port Variants).