g is too difficult, the long, or if there is any material delay in making con- fices, and the like, and also in private residences. A plate may be reversed, thereby admitting air, but an nections, as in long-distance communication, it be- patent on this invention has been granted to Mr. John amount… … journaled on plates, which are hinged to the main ADJUSTABLE WINDOW VENTILATOR. AN IMPROVED TELEPHONE INSTRUMENT.
Patents · Canal · Manufacture · Fiber · Device · Electric furnace · Scientific American · Cushion sole · Alternating current · Rapid transit · York city · Sewing machine · Gas engine · Brass tube · Panama canal
Internet Archive · Public domain (published before 1931). Free to use for anything.
