A system for the manufacture of rollers applicable to writing machines (Machine-translation by Google Translate, not legally binding)

摘要

System for the manufacture of rollers applicable to typewriters, characterized by forming a mass constituted of 10% for proportion of the sulfur in a charge composed of zinc oxide, magnesia carbonate and mineral black, to form a mixture of 150% of the necessary mass of rubber, the proportion of sulfur remaining constant. (Machine-translation by Google Translate, not legally binding)