Throttling triangle scale construction and shipbuilding 802 020 (japan import)

Off white dimensionally stable plastic rulerprecision divisions are numbered both waysdimension markings are in metric for easier workingtwo coloured flutingsscales: 1: 10, 1: 20, 1:25, 1: 50, 1: 75, 1: 100, 1: 125, 1: 200, 1: 250, 1: 500, 1: 750, 1: 1250