Ottica Meccanica Italiana (OMI) was an Italian company producing photogrammetric instruments. It was founded in Rome in 1926 by Umberto Nistri (1895 - 1962) . From 1962 on, Raffaello Nistri (1920-1981), son of Umberto, was president of the company. Since the 1980s the company has been part of a part of Agusta. The air photography branch split into S.A.R.A. Nistri and Aerofotogrammetrica Nistri .
OMI produced the OMI cryptograph, a cipher machine similar to the more famous German Enigma.
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