HINTS TO CORRESPONDENTS. NEW BOOKS ETC. TO INVENTORS. INDEX OF INVENTIONS For which Letters Patent of the United States were Issued for the Week Ending APRIL 18 1899 AND EACH BEARING THAT DATE. 9-Kbrertioernercts. ORDINARY RATES. Inside Page each insertion. - 75 cents a line Back Page. each insertion. a line WOODWORKING New Microscope for Nature Study Metals Wools Fibre etc. QUEEN & CO. Inc. If you want the best CHUCKS buy Westoott's s 100 Broadway New York. The Forbes Patent Die Stocks for Hand or Power. Foot power 9 and I t-inch Swing. Star Lathes ROCK DRILLS AIR
HINTS TO CORRESPONDENTS. NEW BOOKS ETC. TO INVENTORS. INDEX OF INVENTIONS For which Letters Patent of the United States were Issued for the Week Ending APRIL 18 1899 AND EACH BEARING THAT DATE. 9-Kbrertioernercts. ORDINARY RATES. Inside Page each insertion. - 75 cents a line Back Page. each insertion. a line WOODWORKING New Microscope for Nature Study Metals Wools Fibre etc. QUEEN & CO. Inc. If you want the best CHUCKS buy Westoott's s 100 Broadway New York. The Forbes Patent Die Stocks for Hand or Power. Foot power 9 and I t-inch Swing. Star Lathes ROCK DRILLS AIR COMPRESSORS SIMPLEST MOST EFFICIENT and DURABLE. (RAND DRILL co.) Water Emery Tool Grinder 1999 Ruby St. Rockford Ill. MONTGOMERY & CO. 105 Fulton Street New York. THE EGAN CO. CINCINNATI. OHIO. For Sheet Metal Workers. West Mfg. Co. Buffal , scientific american, 1899-04-11
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