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coloured overlay sheets
OPTOMETRIC INSTRUMENTS
colour filter
I.O.O. Marketing Ltd
Europe: United Kingdom
1995
cellulose acetate
overall: 295 x 210 mm
2001.317
OPTOMETRIC INSTRUMENTS
colour filter
I.O.O. Marketing Ltd
Europe: United Kingdom
1995
cellulose acetate
overall: 295 x 210 mm
Two acetate overlay sheets - 'Mint Green' and 'Aqua' blue. Accompanied with an instruction leaflet by Dr Bruce J.W. Evans.
2001.317
Gift of Dr. R.W. Chappell, 2001