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H.O.R (Commonly misconcepted as Hear Our Roar. It actually stands for Harry O. Ricci, the name of the founder of the company) was a siren company based in Long Island, New York that built the Super Sirex and Siro-drone sirens. There are very few active units in the United States. The Super Sirex came in either 25, 40, or 50 horsepower. They either had port ratios of 9/9, 10/10, and 7/10. They were available in both dual and single head models, with or without a rotator. The Siro-Drone came in 2,5,7, and 10 horsepower and were smaller vertical sirens similar to a Fedelcode/Federal siren. Its port ratios were 9,10, and 12 port. HOR also had another vertical siren, similar to the Super Sirex, called the Sirex, of which there are two known to be active in Massapequa, New York.

An H.O.R Super-Sirex 50 being tested in Jefferson City, MO in 1951.