Abstract: An electrostatic filter for the separation of dust particles has collecting electrodes fixed in a housing through which the gas flows and discharge electrodes arranged parallel to them and held stretched between insulators. For the cleaning of the collecting electrodes, a cleaning equipment is fixed to a cable having the discharge electrodes, which can be moved along the surface of the collecting electrodes to be cleaned by using a pulling device having a coiling drum.

Abstract: The electrostatic filter for the separation of dust particles has collecting electrodes (3-7) fixed in a housing (2) through which the gas flows and discharge electrodes (16-20) arranged parallel to them and held stretched between insulators (29, 30). For the cleaning of the collecting electrodes (3-7), a cleaning equipment (33) is fixed to a cable (28) having the discharge electrodes (16-20), which can be moved along the surface of the collecting electrodes to be cleaned by means of a pulling device (30-32) having a coiling drum (26, 27).

Abstract: (57) Abstract: The invention relates to a medical laser treatment module, which comprises a laser radiation source for generating a fundamental wavelength &lgr;1 and which is highly variable in use. According to the invention, the medical laser treatment module is characterized in that it comprises at least one means (2, 3) for generating laser radiation of another wavelength &lgr;1, &lgr;3 and at least one means for optionally injecting the laser radiation of the fundamental wavelength &lgr;1 into the means for generating the wavelength &lgr;2, &lgr;3. The laser module designed in such a manner can be used, in particular, in dentistry and both as an intergratable module and as a fixed component of a treatment unit.

Abstract: The invention relates to a pump chamber (2), in which laser active medium is stored. The pump light is introduced into said pump chamber (2), by means of one or several fluid light guides (12), whereby the fluid used as a light guide is used as coolant for the laser active medium (1).

Abstract: A salient pole includes a flat coil made up of a multilayer winding of round wire. The wire includes an adhesive layer which is cured after winding to consolidate the winding. The winding is within a U-shaped channel which is impregnated with resin to fill any gaps. The flat coil fits over a pole core and is fixed thereto by means of spacers which axially space the coil from the pole core and radially space the coil from the machine casing.