Abstract: A fluid interaction device for establishing an interaction with a fluid, particularly a brake fluid or a fuel fluid. A housing member accommodates a fluid interaction portion. The fluid interaction portion is adapted to interact with a fluid within the housing member. The housing member further comprises a connection portion which can be connected to a fluid supply element. The connection portion is formed as a weldable, tubular end portion so that the housing member can be connected to a joining portion of the fluid supply element by means of a welded joint.

Abstract: A fluid interaction device for establishing an interaction with a fluid, particularly a brake fluid or a fuel fluid. A housing member accommodates a fluid interaction portion. The fluid interaction portion is adapted to interact with a fluid within the housing member. The housing member further comprises a connection portion which can be connected to a fluid supply element. The connection portion is formed as a weldable, tubular end portion so that the housing member can be connected to a joining portion of the fluid supply element by means of a welded joint.

Abstract: A high efficiency variable power amplifier suitable for use in a battery powered device is provided wherein a variable power amplifier has at least a first (2) and a second (12) amplification stage. Base bias potential (8) for the second amplification stage (12) is derived from the bias potential provided to the first amplification stage. In this way, as the bias potential to the first amplification stage is modified to vary the output power, the base bias potential for the second amplification stage is correspondingly modified to maintain the amplifier's efficiency.

Abstract: A plurality of central stations generate and transmit control signals that are received by individual remote stations. Ordinarily, each remote station is assigned to a specific central station. The control signals include a first part that includes identifying information for one or more intended receiving stations, and a second part that includes control signals for the intended receiving station or stations. The remote stations shift operation between a first and second operating mode. In the first mode, they receive the control signals from the central station to which they are assigned, and in the second mode, they do not. For a period of time that is substantially coincident with the first part of the control signals, the remote stations operate in the first operating mode to determine whether the subsequent messages are intended for them. If they are, the remote stations continue to operate in this mode.