27247 ⎘
Games not otherwise provided for; Patience; Other games for self-amusement; Puzzles or games based on the use of optical filters or elements, e.g. coloured filters, polaroid filters, transparent sheets with opaque parts with lenses or other refractive optical elements Optical elements other than lenses used for producing refraction, e.g. prisms
Lens system for a camera objective, camera objective and method for producing a lens system
#2Method for detecting an invisible mark on a card
#3Playing cards
#4LIGHT GUIDE UNIT AND OPTICAL DEVICES USING THE SAME