It is actually correctly marked as an STH-10. An STL-10 has 7 horns, notice this has 6, and notice all the ports between the horns. It is definitely an STH-10.
Unfortunately that Sparton next to the STH-10 was disconnected, I could see the hanging wires.
Hate to burst your bubble but that is indeed a Denver in Krum. Denvers have a cast iron plate for a base as well as a motor connected to the chopper via. shaft like this siren. It is missing the motor cover however. Plus, that looks nothing like a Type B. Compare:
Brendan is right, also the Denver is right next to the Arbucke Historical Society in Sulphur, Oklahoma.
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