Abstract: A probe unit comprising a base in the form of a rectangular plate and a plurality of ultrathin metal wires which are partially secured to the base at a given pitch. Each of the wires comprises a straight portion firmly secured to the base, a bent portion located on an extension of the straight portion, and an inclined portion inclined from the bent portion outwardly of the base toward an inspected surface of an object to be inspected, and an R-shaped portion extending from the front end of the inclined portion outwardly of the base. The bent portion protrudes outwardly from the base and is bent toward the inspected surface. The R-shaped portion forms each probe pin bearing against the inspected surface.

Abstract: A carbon fiber prepreg comprising a unit layer consisting of carbon fibers and a matrix resin layer, and stranded filaments or single filaments incorporated thereinto. The steel fiber is an Ni plated low-carbon dual-phase steel filament and has a filament diameter of not more than 100 .mu.m, a tensile strength of 300 to 700 kgf/mm.sup.2, and an area reduction at fracture of more than 20%. The carbon fibers and steel filaments are aligned codirectionally, and the steel fiber content of the prepreg relative to the carbon fiber is not more than 10 vol %. Sheets of the carbon fiber prepreg are laminated to form a carbon fiber reinforced composite.

Abstract: A catheter guide wire which, despite its reduced diameter, exhibits improved strength and resistance to corrosion by body fluids and medicines. The catheter guide wire 10 is composed of a stainless steel core wire 11, a winding of a low carbon duplex structure steel wire 13 having a diameter smaller than 30 .mu.m and a tensile strength higher than 300 kgf/mm.sup.2, said winding covering the core wire such that tiers of the low carbon duplex structure steel wire run obliquely to the axis of the core wire 11 and have turns crossing each other, and a polyester resin film 15, thinner than 3 .mu.m, covering the low carbon duplex structure steel wire 13. The catheter is composed of a resin inner tube and a low carbon duplex structure steel wire 13 covered with a polyester resin film 15, which runs around the resin inner tube obliquely to the axis and crosses each other.

Abstract: An electromagnetic stirrer for use on a continuous steel casting apparatus, the stirrer employing a coil assembly including a pair of exciting cage coils energized by dual-phase alternate current, each having a hollow conductor interiorly defining a cooling water passage and which are folded and arranged in a compact form.