| http://www.w3.org/ns/prov#value | - The apparatus of claim 1 wherein said belt is looped about longitudinally spaced rollers, said means for driving the belt is a motor operatively associated with one of said rollers and said means for stopping movement of the belt comprises a first disc fixed to rotate with one of said rollers, a second disc disposed in a plane substantially perpendicular to the face of the first disc and having a
|
