351 / | HD | OPTICS: EYE EXAMINING, VISION TESTING AND CORRECTING |
200 | DF | EYE EXAMINING OR TESTING INSTRUMENT {7} |
222 | DF | .~ Subjective type {7} |
233 | DF | .~.~ Lens or filter selectively insertable in optical path {2} |
234 | DF | .~.~.~ Mounted on rotatable disc {1} |
235 | .~.~.~.~ Having plural disc carrier |