I was at a school near my house today, and saw the weirdest thing. The school was old was built sometime around the 20’s, but has a newer Simplex system. There was a Simplex 2099 pull station, along with an annunciator, mounted on a heater! It was an old red furnace right at the front entrance that looked like it hadn’t been used for a long time. The pull was mounted on a backbox, but the annunciator was flush mounted. I’ll have to get some pics the next time I go in there.