Abstract: An interlocking system of identical modules for storage of microfilm cartridges or boxes. The module is capable of being formed as a unitary member in a relatively inexpensive mold. The module has top, bottom, left side, right side and rear walls, and an open front. The top and bottom of the module have corresponding exterior projections and recesses of dovetail cross-section, and the left and right side walls also have dovetail projections and recesses on the exterior surfaces thereof which correspond with one another. The top of one module may be interlocked with the bottom of another module by engaging the adjacent projection and recess thereof. Similarly, a side wall of one module may be interlocked with the opposite side wall of another module.

Abstract: A spacer for use on microfilm reels to facilitate the storage of relatively small lengths of film thereon. The spacer comprises a unitary structure of resilient material having adjacent separable arcuate end portions which are deflected when the spacer is pressed onto the hub of the film reel, the resilience of the spacer material causing the arcuate end portions to come together when the spacer is on the reel hub. A plurality of spacing bars extend from the circular outer configuration of the spacer to define an inner circle having a diameter substantially equal to the outer diameter of the reel hub. The film to be stored may be threaded onto the reel hub between the arcuate end portions of the spacer.