| 摘要 |
398,696. Ventilating-apparatus ; airheating stoves. PIRIE, G. W. and PIRIE, E. M., 2073, Barker Street, Niagara Falls, Canada. Dec. 28, 1932, No. 36696. [Class 137.] Air is heated for ventilation purposes by passage through hollow grate bars 18, the heated air being humidified in a chamber 15 containing a water tank 16, hot air pipes 22 leading to various parts of the house to be heated.
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