MusEYEum Online Catalogue

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Contact Lens Computer
selection chart
Averlan Company Limited
Europe: United Kingdom
Mid-late 20th c.
overall: 205 x 56 mm

'Slide-rule' type calculating chart. Obverse = vertex distance and computed power; Reverse = Ultra thin fitting guide. White inner card. Blue outer sheath overprinted in black.


Gift of A.J. Backhouse, 2003

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