Improvements in tyres for vehicles

摘要

581,810. Wheel tyres. URMSTON, J. Dec. 15, 1942, No. 17831. Convention date, Dec. 15, 1941. [Class 144 (ii)] A core 6 of expanded rubber, i.e., rubber having isolated cells filled with gas or air, placed in the inner tube 8 of a pneumatic tyre to support it in the event of puncture, has an impermeable extensible skin 12.