Improvements in selector mechanism for pneumatic tube and like conveyors
GB403386A
Improvements in or relating to pneumatic tube conveyors
GB391317A
Improvements in or relating to means of selection applicable to and for use in conjunction with all systems of mechanical handling, and more particularly to means for effecting selection by belt conveyors and pneumatic tubes
GB367974A
Improvements in or relating to conveyors
US1908368A
Device for changing the direction of travel, applicable to belt conveyers