B64-748
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Item no.: 170943353856
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B64-748. CALCULATING RULE. E. Smith & Co. Rarest of the extensible sliding rules based on Waterbury's 1876 patent and manufactured by E. Smith & Co. of Rockford. Extends to 38" with board tables. An unusually clean example with no staining or damage. No trammel points or pencil holder. Condition: Good+, Estimate: 80-160
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