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Bi-chromatic flip test
1950s?
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Duochrome Test
Clement Clarke Ltd; Ever-Ready
Mid-late 20th c.
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Freeman bi-chromatic test
Harry Freeman
Mid-late 20th c.
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Freeman bi-chromatic test
Harry Freeman
Mid-late 20th c.
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Freeman Bichromatic Unit
R. Archer & Sons Ltd
Mid 20th c.
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Freeman Binocular Bi-Chromatic Test & case
Raphael's Ltd
20th c.
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Home-made bi-chromatic test
Mitchell, David W.A.
Mid 20th c.
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