Abstract: A bedding sheet assembly, particularly adapted for waterbeds but also usable with other types of mattresses, having a novel mattress belt (1), a first or bottom sheet (2), and a second or top sheet (3). The mattress belt (1) has sides (10) that fit around the perimeter of a mattress (4), a small lip on the bottom (8) to fit under the mattress and a top lip (9) to fit on top of the mattress along its sides. The top lip (9) of the mattress belt contains fastening material (7) for securing the bottom sheet thereto by matching fastening material (17) on the underside of the bottom sheet. A flap (12) attached to the foot end of the mattress belt has fastening material (11) for securing the top sheet (3) thereto. The bottom and top sheets may have ruffled flaps (25 and 18) to fit over the sides of the mattress belt to keep the mattress belt clean and attractive.

Abstract: A heat transfer or like surface has fins attached thereto in a disconnected, spaced apart, substantially parallel relation, the fins standing upright on edge on the surface. A method of producing and attaching the fins has particular utility in the presence of a curved mounting surface, the fins being formed to allow them to be bent in conformance with the curved surface. Apparatus including an adjustable roller mechanism and a braze fixture are useful in forming and attaching the fin material.

Abstract: A method of making mechanical tube joints in whichfirst and second metal working operations, applied through a ferrule installed in a tube end in a header plate, effect initially a tight fit of the tube end in the plate followed by a sealing contact. The method proposes a machine operation in which multiple header plates, each providing multiple tube positions, are supported for indexing movements relative to a bank of tools for performing the second of the first and second metal working functions, complete sealed joints of all tube positions in all plates being effected in a single series of automatic operations.