BARNES' VENTILATOR FOR MATTRESSES, ETCby@scientificamerican

BARNES' VENTILATOR FOR MATTRESSES, ETC

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Many diseases are caused by the use of beds not properly aired; and it is difficult, if not impossible, to properly air, or ventilate, a mattress, made in the usual manner. If this could be done more thoroughly than it generally is, much sickness would be avoided.
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