400 / | HD | TYPEWRITING MACHINES |
663 | DF | LOCKING OR INTERLOCKING MECHANISM {7} |
668 | DF | .~ Locking means actuated in response to a condition {4} |
670 | DF | .~.~ End-of-page lock (e.g., responsive to preset condition) {2} |
670.2 | .~.~.~ Including lock for platen or line-space {1} | |
670.3 | DF | .~.~.~.~> By cam groove and follower |