(under the class definition) Subject matter wherein the projector is constructed to permit a person to write or draw simultaneously on a surface while an image of that writing or drawing is projected from the surface on a viewing screen; or including means such as tracing paper on which an image is
projected while a person simultaneously makes a record corresponding to the image by tracing the image with a pencil or the like.
SEE OR SEARCH THIS CLASS, SUBCLASS:
42, for simultaneous projecting and pointing out part of the projected image.
SEE OR SEARCH CLASS
359, Optics: Systems (Including Communication) and Elements,
447, for a projection screen with means to trace an image.