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Howard's patent ventilator, a scientific invention of cheap construction, applicable at small cost to all buildings, railroad cars, passenger vessels, &c., and a perfect means for the introduction of pure fresh air, without draught.137

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Howard's patent ventilator, a scientific invention of cheap construction, applicable at small cost to all buildings, railroad cars, passenger vessels, &c., and a perfect means for the introduction of pure fresh air, without draught.5111223

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