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The British Refracting Unit
TRIAL CASES, FRAMES AND REFRACTOR HEADS
refractor head; refacting unit
Ellis Optical Co
Europe: United Kingdom, England, Surrey, Croydon
c.1933
metal
overall: 280 x 330 x 120 mm

Black metal instrument with multiple lens settings and variable prisms. Horizontal spirit level. Stem for suspension arm mounting.


2006.531

Gift of Norville Optical Group, 2006



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