The fire alarm system at St. Vincent-St. Mary high school in Akron, Ohio (an official state historic landmark)
Here is the link to a fire drill and photographic system tour at my HS!
Alarms are Simplex 4050s (rare black label variant) and operate on 6VAC. Panel is a Simplex 4247-2. Initiating devices are 4251-20 series pulls and 4255 series heat sensors. There are a few replacement pull stations for broken 4251 along with an Edwards 270 in the stairway by the gym to the girls’ locker room.
2026 update: this system was sadly replaced with “Honeywell slop” and newer LED L series units; I managed to get in contact with @SpockKirk-1701 (Old School Fire Alarms) who has now secured the original hardware.