Went to Burns Park in Ann Arbor with family today and discovered this Projector Horn still up but not working on the Burns Park Elementary school. School was built in 1923 and had a manual pull rod fire alarm system with manual pull rod trip bells and rods. Then sometime later in the mid 1950s they upgraded the system with electric projector horns. The horn is most likely made by either IBM or Autocall.
You oughta see if you can get it somehow (& possibly restore it & get it working as well).
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OSFA will like this!