They have a STH-10 there, but several times while near there, you can clearly hear 2 sirens in attack, but it could be echo.500AT wrote:The Marathon Oil Refinery down by Detroit used to have a few Federal Model 7? sirens that ran off 480 volt three-phase. I don't know if they are still there or not? However, there are other industrial locations in the Downriver area that have sirens for industrial warning applications. In fact, BASF in Wyandotte, Mich. has some sirens, but I am not familiar with what they use.
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