AN IMPROVED LENS-GRINDING MACHINE. POWERFUL FREIGHT LOCOMOTIVE FOR THE PENNSYLVANIA RAILROAD. A NEW POWER-HANDIER. POWERFUL FREIGHT LOCOMOTIVE PENNSYLVANIA RAILROAD. A Word of Advice., scientific american, 1899-04-08
AN IMPROVED LENS-GRINDING MACHINE. POWERFUL FREIGHT LOCOMOTIVE FOR THE PENNSYLVANIA RAILROAD. A NEW POWER-HANDIER. POWERFUL FREIGHT LOCOMOTIVE PENNSYLVANIA RAILROAD. A Word of Advice., scientific american, 1899-04-08
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