Abstract: A waterproofing execution method of a three-plane crossing structure by means of an extensible waterproofing and airtight pressure-sensitive adhesive sheet including sticking the extensible waterproofing and airtight pressure-sensitive adhesive sheet to a peripheral part of three-plane crossing including a point corner part which comes into contact with three planes in a three-plane crossing structure having the three planes wherein the three planes come into contact and respective planes of the three planes also come into contact with each other and peripheral parts thereof includes the processes (A) to (E) as described in the specification.

Abstract: A hydraulic fluid composition for power steering is disclosed, which comprises (a) at least one phosphorus containing compound selected from the group of alkyl, or alkyl substituted or unsubstituted phenyl phosphorus acid compounds, alkyl, or alkyl substituted or unsubstituted phenyl phosphorus thioacid compounds, alkyl, or alkyl substituted or unsubstituted phenyl phosphorus dithioacid compounds, and (b) one or more thiadizaole derivatives represented by the formula: ##STR1## where R.sub.1 and R.sub.2 independently denote a linear or branched alkyl group having 1 to 12 carbons. The composition enables hydraulic systems to be used for longer times without accelerating deterioration of rubber materials employed in the hydraulic system.

Abstract: Ethylene glycol mono-t-butyl ether is produced by contacting a starting mixture of feed materials comprising ethylene glycol di-t-butyl ether and ethylene glycol with a strongly acidic cation-exchange material, thereby to react said ethylene glycol and ethylene glycol di-t-butyl ether to produce ethylene glycol mono-t-butyl ether; the reaction is carried out at about 30.degree. to 130.degree. C. under an atmospheric pressure or an increased pressure; the molar ratio of the feed ethylene glycol to the feed ethylene glycol di-t-butyl ether is about 1:0.01 to 1:20; the feed material may be a mixture comprising ethylene glycol di-t-butyl ether, ethylene glycol and at least one member selected from the group consisting of ethylene glycol mono-t-butyl ether, diisobutylene, and triisobutylene; also the reaction can be carried out by either a batch process or a continuous flowing process.

Abstract: An improved process for producing ethylene glycol mono-tert-butyl ether by reacting ethylene glycol with isobutylene in the presence of a catalyst of strongly acidic cation-exchange material is disclosed which enables the production of ethylene glycol mono-tert-butyl ether in a high yield while suppressing the formation of by-product ethylene glycol di-tert-butyl ether by previously adding ethylene glycol di-tert-butyl ether to the reaction system and conducting the reaction at temperatures of about 60 to 130.degree. C.

Abstract: A timbre-select type electronic musical instrument in which the application of a sound effect unsuitable for the selected timbre is automatically blocked. This instrument includes means for detecting that a certain timbre is selected and means responsive to the signal from said detecting means for preventing the unsuitable effect for the timbre from being applied to a sound.

Abstract: An electronic organ provided with a selector for selecting a three-finger chord playing mode or a one-finger chord playing mode. When the three-finger chord playing mode is selected, a chord is sounded by three or four fingers on a manual keyboard or lower keyboard as in the conventional electronic organ. On the other hand, when the one-finger chord playing mode is selected, there can be automatically sounded one of chord types, such as major, minor, seventh and minor seventh chords, which have, as the root note, the note of a key being actuated on the manual keyboard. The selection of a chord type is effected by a pedal keyboard.