| http://www.w3.org/ns/prov#value | - An optical element (10, 10???, 10???) for deflecting light beams (18, 19), which enter and re-emerge from the latter, in such a way that their angle of emergence (??) is limited, in particular for use as a luminaire-cover, having a plate-like core (11, 11???, 11???) of transparent material which on one side is occupied by microprisms (12, 13) that taper???starting from their root (15)???forming fu
|
