Odontograph....................................... ii 475 Ohm............................................... i 567 Oil, lubricating.................................. ii 371 Oil-car........................................... ii 654 Oil-cup........................................... ii 372 Oil-gas........................................... i 944 Oil-mill.......................................... ii 415 Oil-Stones........................................ ii 476 Oil-wells......................................... ii 926 Opener, cotton.................................... i 359 Ordnance, Construction of......................... ii 477 Ordnance, foreign................................. ii 491 Ordnance-Gun-Carriages............................ ii 492 Ordnance, life-saving............................. ii 291 Ordnance-Machine Guns............................. ii 496 Ordnance, Manufacture of.......................... ii 500 Ordnance, star-gauge for.......................... i 954 Ore, amalgamating................................. i 70 Ore-concentrator.................................. i 372 Ore-mill.......................................... ii 405 Ore-rolls......................................... i 235 Ore-separator..................................... i 372 Ore-stamp......................................... ii 787 Organ, electric................................... ii 506 Organs, Pipe...................................... ii 504 Organs, Reed...................................... ii 511 Organzine......................................... ii 774 Oven, Berdan's.................................... i 231 Oven, charcoal.................................... i 344 Oven, revolving................................... i 233 Overshot wheel.................................... ii 914
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