Abstract: A failure diagnosis assisting device to assist with diagnosis of a failure of a target apparatus includes a display to display a circuit diagram illustrating electric connection between components of the target apparatus, a storage storing circuit diagram information including information to display the circuit diagram and design information included in the information to display the circuit diagram, an operation receiver to receive an operation of selecting a connection terminal of a connector or a component of the target apparatus on the circuit diagram displayed by the display, and a display controller configured or programmed to read from the circuit diagram information in the storage an item of the design information which item is on the selected component or the selected connection terminal and cause the display to display a diagnosis assisting diagram indicative of information corresponding to the item of the design information.

Abstract: Granular acetylene black excellent in dispersibility in rubber, plastic, and the like and conductivity-endowing effect and scarce in dust scattering. The granular acetylene black is made from acetylene black wherein the half-width of the 1355 cm.sup.-1 band in the Raman spectrum is 55 cm.sup.-1 or less and the amount of iodine adsorbed is 95 mg/g or more. The method for making the granular acetylene black comprises granulating the above acetylene black using ion exchange water as a wetting agent, drying the granulated acetylene black at temperatures below 300.degree. C., and selecting particles whose hardness is less than 5 g/particle.

Abstract: The invention relates to a method of heating a piping arrangement and a heating coil used in the heating process by heating pipes through a high frequency wave induction. A spacing between the pipe outer surface and the heating coil is varied in compliance with a change in configuration of the heating coil. According to the invention, even if the coil configuration is particularly changed, it is possible to heat the pipes uniformly to obtain a uniform temperature distribution.

Abstract: Herein disclosed are a method of heat-treating a weld zone of a piping system, in which the outer wall of a pipe is heated by means of a heating coil, while a coolant is present in said pipe, to establish a temperature difference between the inner and outer walls of said pipe thereby to prevent the weld zone of said pipe from corroding and cracking due to stress, and a heating coil therefor. The aforementioned heating coil is wound on the parent tube and the pipe welding desk generally concentrically thereof thereby to heat substantially uniformly all over the region of said weld zone.