Abstract: A device for cleaning the inner surfaces of the front and rear windows of automobiles, said device having a cleaning part connected to a handle, the angle of inclination of the cleaning part relative to the handle being freely adjustable by way of an exchangeable knuckle joint without altering the angle of rotation of the cleaning part relative to the longitudinal axis of the handle. The cleaning part is arched, ensuring uniform, flat cleaning of the inner surfaces of the automobile windows.

Abstract: A spool hub for tape cartridges or cassettes, especially sound recording tape cartridges provided with slide or anti-friction foils, wherein the hub body is equipped with passageways or openings distributed at or over the circumference of the hub body. The passageways are advantageously located between blade-like webs. With this construction there is particularly reduced the friction between the spool and the slide or anti-friction foils, so that there prevail lower temperatures and there is accomplished a reduction of the undesired noise level.