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Title: Steel centre gauge, Whitworth standard 55 degree angles. Pat [Go to resource]
Description: Steel centre gauge, Whitworth standard 55 degree angles. Pattern no. 878, mounted on a display board with 1919-255/2 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: thread gauge Source: Science Museum Creator: J. Chesterman & Co. Limited Identifier: 1919-255/1 Go to resource More Like this...
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