| http://www.w3.org/ns/prov#value | - The improvement of claim 5 wherein said pair of molded plastic light-barrier elements comprise a pair of small plates, each of said plates sliding in one of a pair of parallel and adjacent grooves molded into the outside surface of thecassette and along its front surface transversely of the image-admitting opening, said one of the elements including two surfaces projecting in the direction of the
|
