49 / | HD | MOVABLE OR REMOVABLE CLOSURES |
73.1 | DF | CLOSURES INTERCONNECTED FOR CONCURRENT MOVEMENT {9} |
95 | DF | .~ Closures in spaced openings along barrier {1} |
96 | DF | .~.~ Levers acting between interconnector and closures {1} |
97 | .~.~.~ Rock shaft interconnector |