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 | .~.~ Levers acting between interconnector and closures {1} | |
97 | DF | .~.~.~> Rock shaft interconnector |