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==Science and technology== * [[Optical character recognition]], conversion of images of text into characters * [[Organically moderated and cooled reactor]], a type of nuclear reactor * [[Oxidizable carbon ratio dating]], a method of absolute dating * [[Transvaginal oocyte retrieval]], a technique used in vitro fertilization * Oil control ring, a [[piston ring]] * Over consolidation ratio, a [[consolidation (soil)|consolidation]] measurement in geotechnical engineering
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