Sat Oct 03, 2009 7:22 pm
Although I doubt that H.O.R. actually stands for "Hear Our Roar" rather than the initials of the founder, I believe that these sirens are made by them. They are common in older siren systems in California, and having heard a video of one malfunctioning in Sacramento, they seem to be single-tone, 9 port sirens.
Lex orandi, lex credendi, lex vivendi.