o provision is the patent itself and the intricacy of the machine it sides of the box, are interposed between the first. This made for the least ventilation. It is well known how covers. It is said that over a million dollars was ex- obstructive arrangement gives the air a wide circula- difficult… … be followed of preparing copies for sale at the regu- the river, which forms a natural defense against sur- HENIEB'S VENTILATOB FOB TELEPHONE CABINET8. lation price. prise attacks, and the other three sides are surrounded The large number of sheets of drawings had to be by ramparts in a good state…
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