250 / | HD | RADIANT ENERGY |
200 | DF | PHOTOCELLS; CIRCUITS AND APPARATUS {11} |
559.01 | DF | .~ With circuit for evaluating a web, strand, strip, or sheet {13} |
559.19 | DF | .~.~ Measuring dimensions {6} |
559.22 | DF | .~.~.~ Profile {1} |
559.23 | .~.~.~.~ With triangulation |