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Title: Hepworth's Permanent Way slide rule [Go to resource]
Description: Slide rule, "Hepworth's Permanent Way Rule". Steel rule made by "I & D. Smallwood, Birmingham". In yellow card box with original instructions. 12 3/4"x1 3/4"; 325x45mm License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: slide rule Source: Science Museum Creator: I and D Smallwood Limited Identifier: 1988-7479 Go to resource More Like this...
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