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A metal composing rule comprising of a flat metal strip with one long bevelled edge and a small circular protrusion at the end of the other edge. Above the protrusion there is a V shaped notch in the strip. The rule has no visible marks or calibrations.
L 157mm x W 22mm
Period of use
Used in employment from 1920-1927
Used in employment from 1927-1966
Place of use