Abstract: A holder for supporting magnetic cylindrical tools of varying diameter such as wrench sockets, drill bits, etc. in order. A member having a series of recesses having shapes corresponding to the tools to be held is backed by an elongated magnet. In one embodiment, the member is a non-magnetic material and the magnet is made up of a plurality of transverse magnetic regions, having alternately north and south pole regions on the surface toward the recesses, with the lines between adjacent north and south regions aligned with the centerline of the recesses and a narrow non-magnetized region separating each pair of adjacent magnetic regions. The magnet may be in the form of individual magnet pairs spaced along a magnetic metal sheet with the interface between each magnet pair aligned with a recess. A magnet layer may be provided on the back of the metal sheet so that the assembly may be mounted on a magnetic metal surface. Other variations in magnet and recess structure are described.

Abstract: A method of manufacturing semiconductor devices of the type wherein regions of oxide such as silicon oxide recessed or inset in a silicon substrate are formed by oxidation of the silicon with the use of a masking layer protecting locally against the oxidation. In order to prevent the formation of a projecting oxide beak under the masking layer a nitride oxidation mask is applied directly to the substrate which has been previously ion-implanted to a controlled depth and then annealed to generate a dense dislocation network array on the substrate surface to prevent mechanical stress defects which normally would occur when a nitride mask is applied directly to a substrate.