Pfeilverzahnung (Femenino)

double-helical gearing (Neutro)

double-helical teeth (Neutro)

herringbone gearing (Neutro)

herringbone teeth (Neutro)

diente de espiga (Neutro)

diente doble helicoidal (Neutro)

engranaje doble helicoidal (Neutro)

人字齿 (Neutro)