| 摘要 |
PCT No. PCT/US96/01584 Sec. 371 Date Feb. 5, 1996 Sec. 102(e) Date Feb. 5, 1996 PCT Filed Feb. 5, 1996 PCT Pub. No. WO97/28471 PCT Pub. Date Aug. 7, 1997All-ceramic retroreflective elements which may be used in pavement markings comprising an opacified ceramic core and ceramic optical elements partially embedded into the core. |
