A post about the differences in AeroDynic models got me thinking about how Federal designated their motorized siren models. There are "letter" models and "number" models. There was the C (coaster), E, Q, V, W & X. The Y was a W with a SolaRay. Then there were the 60- and 70-Series. However, the chrome version of the 28 is the 66!
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