Aplanats

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      1. <skos:prefLabel xml:lang="en">aplanats</skos:prefLabel>

      2. <skos:altLabel xml:lang="en">aplanat</skos:altLabel>

      3. <skos:altLabel xml:lang="en">aplanatic lens</skos:altLabel>

      4. <skos:broader rdf:resource="http://museovirtualfelixcanada.digibis.com//concepts/53892" />

      5. <skos:note xml:lang="en">Symmetrical lens design created in 1866 by Steinheil, which formed the basis for most general-purpose lenses until the early 20th century.</skos:note>

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