I’m not sure of the model numbers. All I know is that they were T-Bars and that the high school I went to had only single pull stations rather than dual. It was my elementary school that had the combination which it doesn’t have anymore since they upgraded the system to “crap rebranded Notifier” as SimplexTech would say. I never paid attention to the pulls because they didn’t make deafening sounds that sound good at scare me at the same time.
It’s a very big library. 10 horns which are spaced a good distance apart.4 of which are in rooms themselves. My college also had 4051s in some small rooms before we got “crap rebranded Notifier”. I have never been in the library when they were testing it, but one of these days.
Probably why the segregated gyms at my middle school had only one horn in each.