THE DETECTION OF GAS LEAKAGES. THE DETECTION OF GAS LEAKAGES. 400 Asphalt as Fuel. London as a Commercial Entrepot. Novel Mode of Making Electric Lamps. NEW NUT LOCK. IMPROVED NUT LOCK. COMBINED TAG AND ENVELOPE. COMBINED TAG AND ENVELOPE. Improved Method of Producing Printing Surfaces from Gelatine Reliefs. O., scientific american, 1883-08-11
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