250 / | HD | RADIANT ENERGY |
200 | DF | PHOTOCELLS; CIRCUITS AND APPARATUS {11} |
216 | DF | .~ Optical or pre-photocell system {11} |
229 | DF | .~.~ Light valve (e.g., iris diaphragm) {3} |
231.1 | DF | .~.~.~ Actuated by dynamic external physical quantity {4} |
231.11 | .~.~.~.~ Actuated by gauge element deflection |