It looks like version of the generic civil defense logo like what we used to use here in Illinois. Here is a picture of one of the old Illinois stickers.gman 1 wrote:Sorry for the bump; could someone please tell me what the symbol on the side of the blower box is? It definitely is not the Civil Defense Logo.
They represent the class of sirens by decibel rating. For example, 617 is the Thunderbolt class because of this.iliketobehappy wrote:I hate to sound stupid but I don't understand the numbers on the top of some of the pages in the pdf file. Like the 611, 612, 613 and so on. Could someone please explain this to me????
Perolia? Like Peoria? Are we talking about the same place?Mark N wrote:They represent the class of sirens by decibel rating. For example, 617 is the Thunderbolt class because of this.iliketobehappy wrote:I hate to sound stupid but I don't understand the numbers on the top of some of the pages in the pdf file. Like the 611, 612, 613 and so on. Could someone please explain this to me????
man 1-look at my previous post. Perolia had 5 Thunderbolts by 1964, and now they have a system of Whelens (4004s and 2XXXs)
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