Abstract: The active implant for use in medicine, such as for tooth implants or endoprosthesis For positions influencing the growth mechanisms of the bone and which remain in place for a long time. The active implant comprises a base and flexible structures therein provided with an oxide which contains growth stimulators and has a stable p-n junction.

Abstract: Automatic drafting device of the type employing a tubular writing pen, particularly an adjustable sealing element which is used against the writing tip of the pen when the pen is in a retracted rest mode. The sealing element is laterally disengaged from the pen tip when the pen is an extended writing mode. The sealing element which may be in the form of an elastic spheroid prevents drying out of ink within the capillary channel when the pen is not in use. The blocking assembly is characterized by its ability both to lock the tubular writing pen in its rest position and to lock the sealing element in its laterally outward position so as to avoid interference with the pen during temporary moments of non-writing.