AN IMPROVED PACKING. PROFESSOR DEWAR'S APPARATUS FOR LIQUEFYING AIR AND OXYGEN. PROFESSOR DEWAR'S APPARATUS FOR LIQUEFYING AIR AND OXYGEN. Egyptian Cotton. PRATT'S CONE BELT SHIFTER. A NEW LOGGING JACK. WALKER'S ROD PACKING. PRATT'S CONE BELT SHIFTER., scientific american, 1896-04-11
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