| 摘要 |
A method for manufacturing a directionally dependent reflective surface on a substantially cylindrical body ( 1 ). The method comprising the engagement of a tool ( 4 ) with the outside surface ( 8 ) of the body, thereby forming at least one groove ( 23 ) therein with a cross section, when measured parallel to the longitudinal axis ( 2 ) of the body, that is asymmetric and wherein the groove is formed without removal of material from the body.
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