| 摘要 |
1,264,052. Tyre treads. SEMPERIT OSTERREICHISCH - AMERIKANISCHE GUMMIWERKE A.G. 4 March, 1970 [25 Nov., 1969], No. 10380/70. Heading B7C. A pneumatic tyre has at least part of the tread surface which, in use, contacts the ground constructed with an average radial depth of surface unevenness in the range from 0À01 to 1 mm. The tread comprises a central circumferential rib 1 and individual blocks 2, 3, (4) separated by grooves 5, (5<SP>1</SP>) with the surfaces of the blocks and ribs provided with indentations 6. The indentations are formed either by moulding during the vulcanization process or by grinding or sanding after moulding and vulcanization.
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