Master gears for checking cylindrical gears; gear. blanks and gearingPignons-étalons pour la vérification des roues cylindriques; corps de roue et denture
DIN 3970-1:1974 history
2010DIN 3970:2010 Master gears for checking cylindrical gears - Gear blanks and gearing
1974DIN 3970-1:1974 Master Gears for Checking Spur Gears; Gear Blank and Tooth System