I was sent this by fellow user "TNT1001", and I thought it was cool, so I decided to post it here. I apologize if it has been posted before. It shows the production of sirens at the Federal plant back in the '50s or 60's, but I would presume 50s since the company is referred to as "Sign and signal", which existed from '58 to '76, if I remember correctly.
https://www.youtube.com/watch?v=BDxmC6Zp8X0