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Vertex Slide Rule
MANUFACTURING AND DISPENSING EQUIPMENT
slide rule
Obrig Laboratories (Great Britain) Ltd
1960s?
plastic
overall: 30 mm x 165 mm

White plastic slide rule with clear transparent slider, dioptric and centimetre scales. Features black and red eyeball symbols and concave/convex lens symbols. Reverse plain apart from Obrig brand logo.


2017.23

Gift of Mr John Dixon Salt FCOptom, 2016



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