Abstract: Hollow, cylindrical, seamless metal master for producing seamless diffuser sheets of preselected length and width. Additional aspects of the invention include a hollow cylindrical seamless invertable elastomeric master and method of making the same and an apparatus and process for effecting variable diffuser recording in photosensitive medium.

Abstract: A retention device includes a one-piece longitudinal anchor member having opposed first and second ends, a nut retaining part formed between the first and second ends, a through hole extending through the nut retaining part, and an engagement surface around the through hole. A screw rod extends through the through hole and engages threadedly a nut, and is turnable between folded and unfolded positions, in which the screw rod is moved toward and away from the first end, respectively. The nut is movable within the through hole between engaging and non-engaging positions. The nut engages and disengages the engagement surface in the engaging and non-engagement positions when the screw rod is in the unfolded and folded positions, respectively.

Abstract: A multi-functional carrying bag including a center storage compartment for forming a center interior storage space therein; the top wall having an opening for access to the center interior storage space. The carrying bag further includes an upper front storage compartment for forming an upper interior storage space and a lower front storage compartment for forming a lower interior storage space therein. The carrying bag also includes a rear storage compartment for forming a rear interior storage space therein; a first side storage compartment for forming a first side interior storage space therein; and a second side storage compartment for forming a second side interior storage space therein. The rear wall of the upper front storage compartment forms the front wall of the center storage compartment.