The invention relates to a device for separating dust from flue gases from combustion plants, especially solid fuel combustion plants, comprising at least one dust filter via which the flue gases are guided, and by means of which the dust from the flue gases can be filtered out as it passes through the dust filter. According to the invention, the control time intervals have a duration that can be varied by the control device as a function of the rotational speed of the engine. The spring clip is adapted to releasably clamp an ear-piece portion of a hearing aid, such that a user can utilize the tool to subsequently guide the ear-piece into their ear. The system facilitates the carrier and cargo transaction by providing each party required and requested information concerning the carrier and the cargo. The present invention is also directed toward methods of separating carbon nanotubes into populations of specific types or range of types via selective functionalization and electrophoresis, and also to the novel compositions generated by such separations.