Waddle fan
http://dbpedia.org/resource/Waddle_fan an entity of type: Advocate109774783
Waddle fans, sometimes incorrectly spelled Waddell, were large centrifugal fans, used to ventilate coal mines. They were distinguished both by their extremely large size and by the fan having an integral shroud and so being able to be mounted in the open air.
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Waddle fan
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39796198
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1065632996
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note
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Waddle fans, sometimes incorrectly spelled Waddell, were large centrifugal fans, used to ventilate coal mines. They were distinguished both by their extremely large size and by the fan having an integral shroud and so being able to be mounted in the open air.
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lower-roman
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7593