49 / | HD | MOVABLE OR REMOVABLE CLOSURES |
263 | DF | TREADLE OR IMPACT INITIATED OPERATOR {8} |
269 | .~ Spaced open and close initiators on opposite sides of closure {2} | |
270 | DF | .~.~> Plural interconnected paired initiators |
271 | DF | .~.~> Releases latch from either side |