Abstract: A mixing apparatus utilizes piston burettes driven by stepping motors as metering pumps to deliver component liquids to be mixed into a liquid stream in a selectable constant mixing ratio. A computer-based automatic control system is used to control the regulated take up of the respective components by the burettes and the delivery of them to a mixing device. The computer calculates the rates of stepping of the respective motors so that each component is delivered over the same period of time and at a respective uniform rate. The computer also controls associated switching valves via an interface device and may be a desk top machine with keyboard or pre-programmed data input.

Abstract: In an endless track having chain links which comprise tubular bodies arranged transverse to the direction of movement and connected to the adjacent chain links, as seen in the direction of movement, by connector links as well as rod members which extend through the connector links and through the tubular bodies, the tubular bodies and, if desired, the connector links of each chain link being so dimensioned, transverse to the moving direction, that they support each other laterally from a certain given flexure of the chain link on.

Abstract: An endless track having chain links which comprise tubular bodies connected by connector links to the adjacent chain links, as seen in the direction of movement, is widened by at least one further tubular body and one further connector link, all tubular bodies and connector links preferably being of uniform basic dimension.