(under subclass 3.16) Subject matter in which the light rays are compared with a record located inside the missile (e.g., a film strip or photograph).
SEE OR SEARCH CLASS
250, Radiant Energy,
548, and 559.01+ for optical or prephotocell systems having a web, or a web strand in the optical path, and subclasses 555+ for a record in the optical path.
342, Communications: Directive Radio Wave Systems and
Devices (e.g., Radar, Radio Navigation),
5, for such systems where the record is a radar map. 356, Optics: Measuring and Testing,
429+, for the monitoring of webs for variations in the response of the webs to visible light.
