Abstract: A dispensing apparatus comprises a try-like housing having recesses in an upper surface each for accommodating an item to be dispense. A non-return mechanism is located in the housing adjacent to each recess and has a member movable between a first position wherein the member is retracted to a position substantially flush with the recess sidewall and a second position (as seen in the figure) wherein the member projects into the recess to prevent re-insertion of an item. The movable member is retained in the first position by an item accommodated in the recess and is spring-biased to assume the second position when the item is removed. A microswitch is responsive to the movement of the member to signal when the member moves from the first to the second position and thus when an item is removed from the recess.