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Paper maker's slide rule

1918-1925

One of two paper maker's slide rules

1918-1925

Thomlinson's paper equivalent slide rule 23" by 3 1/2"

Two paper maker's slide rules, patented by William Stanhope Buchanan in 1918: an initial rough model and a finished example made by C.T. Cooper and Sons for Becker and Co.

Two paper maker's slide rules

1918-1925