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Rosen Foriagraph
OPTOMETRIC INSTRUMENTS
heterophoria test; foriagraph
Europe: United Kingdom
c.1930
metal
overall: 264 mm x 162 mm

Foriagraph consisting of black metal battery-compartment handle, on-off switch, rectangular panel bearing white chart on front. Two filter lenses (red and blue) in shiny white metal rims with handles.


1999.2805

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