(under subclass 18) Subject matter wherein the original or the photos:graphic paper is in a curved position in the optical path during copying.
(1) Note. Many of the patents in this subclass relate to distortion introducing or rectifying.
SEE OR SEARCH CLASS
353, Optics: Image Projectors,
5+, and 69+ for image projectors having distortion compensating or rectifying means, some of which projectors are for transferring images to or from a curved surface.