4. Optics: measuring and testing
  5. Refraction testing
  6. Prism engaging specimen
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Davidse Jan

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DE Mey, II Charles F.

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Deckelman Louis M.

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Dehait Jack T.

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deJong Leendert Pieter

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Demsky Herbert M.

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DeRemigis Joseph

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Di Martini Raymond G.

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Dietz David C.

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Dittman Richard D.

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Dix Malcolm James

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Dobes Karel

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Dorsman Adrian K.

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Duffield Jack J.

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Durst AG Fabrik Fototechnischer Apparate Bozer

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Dyche George E.

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Dyna-Tech Corporation

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