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Chart for Fused Bifocals For 'Twofo' and 'Perflex' Blanks
ARCHIVAL ITEMS
selection chart
United Kingdom Optical Company Ltd
Europe: United Kingdom
20th c.
card
overall: 385 x 516 mm
2002.284
ARCHIVAL ITEMS
selection chart
United Kingdom Optical Company Ltd
Europe: United Kingdom
20th c.
card
overall: 385 x 516 mm
Cardboard chart, yellow, folding style with suspension loops for hanging. Printed in black and red with stock range chart plotting reading additions (dioptres) against convex and concave segment side surfaces.
2002.284
Paul Fairbanks Archive