Manufacturing system of exhaust pipes, sound shock absorbers, for explosion engines (Machine-translation by Google Translate, not legally binding)

摘要

System for manufacturing exhaust pipes, sound dampers, for internal combustión engines, characterized by the arrangement of an open tube at its two ends, to which it is surrounded, for almost its entire length, by another tube of greater coaxial diameter and envelope, the space between these two tubes being closed by means of plates fixed at the ends of the larger pipe, the space thus determined having been previously filled by refractory, porous, large-area and light-weight material, such as asbestos, coal in grain or fibers and metal shavings. (Machine-translation by Google Translate, not legally binding)