| 摘要 |
1,184.566. Rear illuminated signs. IMPERIAL CHEMICAL INDUSTRIES Ltd. 18 March, 1968 [30 March, 1967], No. 14595/67. Heading G5C. [Also in Division G2] A sign as described in Specification 1,184,565 has the Fresnel lens formed of two annular lenses, one surrounding the other, lenses having a common boundary 57. Each lens is illuminated by a toroidal-shaped fluorescent lamp. |
