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The George Young Threshold Test
OPTOMETRIC INSTRUMENTS
threshold test
Raphael's Ltd; Newbold & Co Ltd
Europe: United Kingdom, England, London
c.1948
card; leatherette

Spiral-bound booklet with black leatherette cover and cardboard pages containing an introductory text and series of single coloured dots, black, red, green, yellow and blue.


1999.29

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1999.29a.jpg

1999.29b.jpg

1999.29c.jpg

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1999.29.jpg

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