| 359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
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| 362 | DF | COMPOUND LENS SYSTEM {8} |
| 399 |  | .~ Telescope {12} |
| 400 | DF | .~.~> With viewed screen |
| 401 | DF | .~.~> With image anti-rotation |
| 402 | DF | .~.~> Periscope {2} |
| 407 | DF | .~.~> Binocular {4} |
| 419 | DF | .~.~> With plural optical axes {1} |
| 421 | DF | .~.~> Selectable magnification |
| 422 | DF | .~.~> Variable magnification |
| 423 | DF | .~.~> With relay {1} |
| 425 | DF | .~.~> Focusing or relatively sliding barrels {2} |
| 428 | DF | .~.~> With reticle |
| 429 | DF | .~.~> With line of sight adjustment {1} |
| 431 | DF | .~.~> With prism or U-shaped optical path |