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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Alcohol Slide Rules
Blake / Proofing Set Type 4
T.O. Blake Ltd.
UK
Wood/brass
1905-1947
23.5 cm
Gauging
Notes:
Proofing set comprising of two duplex rules. It dates from post 1824 because of Imperial Gallon based units/gauge marks.
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