BARNES' VENTILATOR FOR MATTRESSES, ETC
2023-12-2 14:0:2 Author: hackernoon.com(查看原文) 阅读量:5 收藏

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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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