tentee in this country to secure a pa- Rue Mfg. Co., Filbert St., Phila., Pa., U.S. A. 79. currents. Illustrated with seventeen engravings. Con- . Dr. W.F. KNOWLES, : tent in Great Britain, where his rights are as well pro- tained in SCIENTIFIC AMERICAN SUPPLEMENT, NO. 4°31. West Somerville, Mass.…
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