As you've probably already seen in my first post, I talked about the sirens in Billings. They are all ACA Penetrator-series sirens. I talked with some city people recently and they said all the P20/RM130 sirens in town were mostly installed in the late 1980s to early 1990s. We had Thunderbolts before.
Basically, the Penetrator was the successor to the Allertor, if I remember correctly.
I know a little bit about the Penetrators now because of this chat that I had. I don't think that they are still making them, per the ASC site.
So as a result of all this research I've been doing, I've got a few questions. Sorry to bore you with all of them...
--When did they quit making 'em and why?
--What siren type succeeded it?
--When did they first come out?
--What other cities have them?