Abstract: An improved two cycle engine is disclosed which includes a subchamber which is in communication with the exhaust port with a cylindrical valve rotatably disposed therebetween. A reed valve unit is turnably supported in the inlet port to open and close the latter. The cylindrical valve is operatively connected to the reed valve unit by way of a linkage mechanism. Either of the cylindrical valve and the reed valve unit is actuated by a servomotor and the other one is actuated by the linkage mechanism. The servomotor is controlled with the aid of a control circuit so as to allow the engine to be operated at a predetermined number of revolutions.

Abstract: Two cleaning elements, each having a magnet and a brush, are arranged outside and inside of a windowpane. The cleaning elements attract each other by magnetic force through the windowpane and they move simultaneously when one of them is moved in operation. This cleaning device is convenient and safe for cleaning windowpanes of higher buildings because cleaning of both sides of the windowpanes can be done at one time working indoors.