Perfected protection face. (Machine-translation by Google Translate, not legally binding)

摘要

Improved protection mask, characterized in that the rubber mask or mask proper is hermetically coupled in its suction opening a cup that is carrier of the intake valve, and where a filter cartridge that is attached to its front is threadedly connected, by means of a clamping frame washer, a supplementary filtering sheet, which acts as a purifying element of the air that will enter the cartridge, filter, retaining dust and other particles that this air could carry in suspension. (Machine-translation by Google Translate, not legally binding)