This was partially inspired by seeing the fire alarm system at my dad’s old elementary school…
The Robinson High School, built in 1959, originally had an old Simplex 4248-1 panel (relabeled IBM panel), 4030-2 horns in the hallways and lobbys, and regular 4030 horns in the cafeteria, gym, music room, locker rooms and auditorium. The pull stations were Simplex 4251-11 Chevrons (I heard that there were IBM-rebranded Chevrons, so they had to be around since the 1950s). They also had the old metal Chemtronics heat detectors in various places. They also had Simplex-labeled 4015-6A bells for the school bells.
In 1970, they installed a Simplex 4040 horn in a wood shop room, and one in the home economics room, since the alarms couldn’t be heard really well there.
In 1978, the 4030 in the cafeteria broke down, so a 4050 horn on a 4050-80 light plate replaced it.
Between 1979 and 1980, two of the Chevrons broke down, so they were replaced with Simplex 4251-20 T-bar pulls.
In 1983, a few of the Chemtronics heat detectors were replaced with ESL smoke detectors relabeled by ADT.
In 1999, the old 4248 panel died down, so they installed a Simplex 4005 panel next to it, and kept the 4248 for terminal wiring. The 4030-2s were left intact in the hallways, and the 4030s in the auditorium and gym were left intact, as was the 4050/4050-80 in the cafeteria and the 4040 in the wood shop class. But the 4030s in other places were replaced with Simplex 4903-9236 horn/strobes. Another Chevron broke down and was replaced with a Simplex 2099-9754 pull.
In 2001, two of the Chemtronics heat detectors broke down, and were replaced with Simplex 4098-9601 TrueAlarm smokes.