(under subclass 819) Subject matter wherein the mounting includes or is combined with structure to offset or minimize the effect of temperature change.
(1) Note. The structure classified here may be lens supporting material whose dimensions remain unchanged over a range of temperature change or heating structure for offsetting temperature changes otherwise occurring or for reducing moisture accumulation or heat insulating structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
362+, for compound lens systems with desiccating means.
507+, for mirrors with moisture prevention.
554+, for mirrors with distortion prevention.
823, for lens mountings with axial adjustment. SEE OR SEARCH CLASS
219, Electric Heating,
521, for electrical heaters including a support for the material to be heated.
