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DK148742A1941-07-011942-06-30Fremgangsmaade til Fremstilling af et optisk Element, f. Eks. en Linse, med mindst een asfærisk Begrænsningsoverflade.
DK66606C
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Un procedimiento para aumentar la diafanidad de las piezas ópticas reduciendo el exponente de refracción en las superficies de límite de dichas partes.