.~.~ Electro-optical, magneto-optical, or photochromic type
DEFINITION
Classification: 396/506
Electro-optical, magneto-optical, or photochromic type:
(under subclass 505) Subject matter having optical media whose light transmission characteristics can be changed by an application of an electric or magnetic field or of light.
SEE OR SEARCH THIS CLASS, SUBCLASS:
262, for exposure control circuit for electro-optical diaphragm.
457, for shutter of electro-optical, magneto-optical, or photochromic type.
SEE OR SEARCH CLASS
359, Optics: Systems (Including Communication) and Elements,
