Abstract: A rotary centrifuge seal consisting of a silicone rubber ring-shaped diaphragm secured to a phenolic ring member is manufactured by inserting the preformed phenolic compound element into a mold cavity of an injection compression mold with precise fit. The phenolic element is then covered with an overmold cavity and silicone rubber is injected into the overmold cavity by runnerless injection techniques in contact with exposed bonding surfaces of the phenolic compound element and the silicone rubber molding components and the phenolic compound element are compressed together to form a strong molecular bond with the application of heat and without the required use of primers, adhesives, bonding agents or mechanical bonding. The phenolic compound element is shaped in the form of a ring having external and internal peripheral surfaces whereby the exposed bonding surfaces include these internal and external peripheral surfaces to provide a more secure bond.

Abstract: A desk-top, table-top or bench-top holder for pens, pencils, elongated tools and the like, having a body provided with a plurality of parallel, elongated chambers extending downwardly through an upper surface. The body has a generally flat bottom surface transverse to the parallel elongated chambers to serve as a base under-surface upon which the body can rest on a horizontal supporting surface. The body has an upper surface at an inclined angle to the parallel, elongated, chambers so that the chambers are accessible through elongated openings at the upper surface. The body can be produced by any desired technique, such as molding or machining, or can be produced by providing a plurality of tubular elements bonded together in a side-by-side abutting relationship.