359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
642 | DF | LENS {32} |
804 | .~ With viewed object support {3} | |
805 | DF | .~.~> On lens supporting handle |
806 | DF | .~.~> Relatively movable informatory sheet and lens (e.g., reading machine, etc.) |
807 | DF | .~.~> Flat opaque document or picture |