Potter OSYSU-A2 I honestly have no idea what this thing is, but it says Potter on it, so that means it goes on the website. Brand Potter
Simplex 4259-25 Category : SimplexThis is a photoelectric smoke detector from the mid to late 1970’s.
Simplex 477-669 Category : SimplexOddly enough, the model number on this particular smoke doesn’t fit the typical pattern for Simplex devices.