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Duochrome Test
OPTOMETRIC INSTRUMENTS
bi-chromatic test
Clement Clarke Ltd; Ever-Ready
Europe: United Kingdom
Mid-late 20th c.
metal
2000.295
OPTOMETRIC INSTRUMENTS
bi-chromatic test
Clement Clarke Ltd; Ever-Ready
Europe: United Kingdom
Mid-late 20th c.
metal
Hand-held duochrome test. Grey metal 'bicycle lamp' battery pack with red and green test chart mounting.
2000.295