little buttons on the desks of the managers signals are sent to persons in the various departments of the establish ment. Cheap and effective. Splendid for shops offices dwellings. Works for any distance. Price $6 with good Battery. F. C. Beach & Co. 246 Canal St. New York Makers. Bend for free illustrate° Catalogue. vine Spinning Ring Co Whitinsville Mass. & Williams cor. of Plymouth and Jay Brooklyn N. Y. Metals. R. Lyon. 470 Grand Street New Tork., scientific american, 1875-07-11
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