Abstract: A flat file for storing drawings, providing an easy way to pull a drawing from the middle of a stack of drawings without disrupting the previous order of the stack. A movable board mechanism allows one to lift the drawings stacked on top of a selected drawing and hold them while the selected drawing is retrieved. Later the drawing can be replaced under the board mechanism and the stack returned to its original order.

Abstract: A hanger apparatus comprises two arms spring-coupled to an extension of the hub of a swivel hook; which arms are equipped with interlocking elements to latch the hanger in a closed (folded) position; and whereby unlatching is achieved by a couple (twisting-moment) applied to the hub and the resulting relative motion between the elements disengages the arms, allowing the springs to open the hanger, and relatching is achieved by pushing the arms together until the elements re-engage.