| 摘要 |
547,121. Pneumatic tyres. UNITED STATES RUBBER CO. July 21, 1941, No. 9180. Convention date, Aug. 9, 1940. [Class 144 (ii)] In a pneumatic tyre tread in which slits 8 are formed in the ribs 6 the length of the slits at the bases of the ribs is substantially less than at the surface of the tread. Various forms in cross section of the slits are described in the Specification. Specification 542,268, [Group VIII], is referred to.
|
