Abstract: A portable shrink tubing marking device comprised of a hand held grip mechanism to transfer printing material from a tape supply thereof onto a preformed roll supply of flattened tubing, utilizing a character selection and cut-off wheel and dual cartridges carrying the supplies of shrink tubing and printing tape.

Abstract: A layup of sheet material and flattened heat shrink tubing to be processed in a typewriter in the usual manner with said tubing releasably held in alignment by adhesive and/or removable tapes and exposed so as to be imprinted with indicia and individually cut to length and subsequently applicable to the end portions of wiring to identify the same.

Abstract: A lamination of sheet material to be processed in a typewriter in the usual manner and within which is contained removable lengths of flattened heat shrink tubing releasably held in alignment by adhesive and exposed to a superimposed film of pressure transferable printing material, the laminations presenting a manifold and the front of which is lined to coincide with the placement of the shrink tubing for accurate imprinting of indicia thereon, the imprinted shrink tubing lengths being individually removable and applicable to the end portions of wiring to identify the same.

Abstract: Angular position measuring apparatus includes a prism mounted on a shaft whose angular position is to be determined, and a light source for directing a beam of light onto the prism. The prism is formed so that the light beam enters one surface of the prism and is refracted by another surface and caused to be directed in different directions as the prism, and thus the shaft, is rotated. Also included is an array of photo detectors positioned so that the refracted light impinges on various ones of the photo detectors depending upon the angular position of the shaft. The photo detector on which the light impinges is thereby caused to generate an electrical signal which is applied to utilization apparatus.