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Bishop Harman's Diaphragm Test
ORTHOPTIC INSTRUMENTS
diaphragm test
Gowllands Ltd
Europe: United Kingdom, England, London
Post 1931
metal; chrome; wood
overall: 245 x 425 x 102 mm

Black metal rod with chrome chin rest and fold-out wooden handle with chrome collar stem. Adjustable aperture with ocular base line scale and ocular poise scale (both in mm). Fixation target holder.


1999.316

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