359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
362 | DF | COMPOUND LENS SYSTEM {8} |
399 | DF | .~ Telescope {12} |
407 | DF | .~.~ Binocular {4} |
409 | .~.~.~ Body supported or with handle {2} | |
410 | DF | .~.~.~.~> With focusing means |
411 | DF | .~.~.~.~> With adjustable interocular distance |