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This is Sirens & Aviation and More's Federal Electric Type D. This is a special Type D because it has a 5-port chopper/rotor which is rare to find since the Type/Model D typically comes with an 8-port chopper/rotor. The sound differences are very noticeable between the two videos below.
This is the rare 5-port Federal Electric Type D.
This is a regular 8-port Federal Sign & Signal Model D.
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