Abstract: The invention relates to an active suspension system for controlling the suspension of a wheeled land vehicle, which comprises an actuator (31) of variable length in parallel with a spring (34), connected between the body or chassis of a vehicle and a wheel and hub assembly (40) of such. The extension/contraction of the actuator is controlled by a control unit (60) in response to parameters measured by various sensors (61, 64, 65, 66 and 62). The control unit (60) also makes allowance for loads on the vehicle not measured by the sensors, so that accurate control of the suspension system is achieved.

Abstract: A milling and retrieval tool (10) to remove a packer (14) from a casing (12), and a method to release the tool (10) from the packer (14) for separate removal from the casing (10). Tool (10) includes a sleeve (58) having resilient fingers (60) which spring inwardly against a reduced diameter mandrel portion (42) in the upward position of the sleeve (58) to permit passage of the sleeve (58) through the packer bore (15) for release of the tool (10) from the packer (14). The sleeve (58) is moved upwardly along the mandrel (11) by pressurized drilling fluid discharged from a lower opening (32) of a bullnose section (26). A shear ring (50) is provided to permit downward movement of the sleeve (58) adjacent a reduced diameter portion (30) of the bullnose section (26) for release of the tool (10) from the packer (14) upon the reaching of a predetermined jarring or bumping action of the sleeve (58) against the packer shoulder (18).

Abstract: A device for extracting energy from sea waves by the motion of a submerged cylinder held normal to the direction of motion of the waves by tie members at each end of the cylinder. The tie members at their other respective ends are moored to the sea bed. Changes in the load on the tie members are arranged to turn in one direction a drum drivably connected to a vane pump. A spring, or a counterweight acting on a cam-shaped pulley, is arranged to apply a biasing load to the drum in the other direction so as to produce an oscillatory movement of the drum from changes in load on the tie members and drive the pump. A hydraulic motor connected to an electric generator is driven by the pump.The drum may be situated at the moorings on the sea bed, or at the cylinder.