A telecommunications system is disclosed which is user programmable permitting inter and intrapremises communications from existent two-wire telephone extension sets at a customer's premises. The system may be functionally described as a telephone call interceptor comprising a number of building blocks for providing a plurality of features which the existent telephone extension sets may not be capable of by themselves. A data processor (110) receives data input from an incoming ringing signal de...

A radar system includes signal processing means (SP) operable to determine the velocity relative to a receiving antenna (AR) of each object from which transmitted radiation is reflected. The signal processing means delivers signals representing the relative velocities of objects in each of a number of predetermined ranges of velocity values. Storage means (SM) are provided which comprise, for each increment of antenna bearing, a separate storage location for each of the ranges of velocity values...

An oven system comprises a grill unit and a microwave oven unit built into a standard kitchen unit framework or other structure for receiving same with the grill unit surmounting the microwave oven unit. A duct extends from the rear of the microwave oven unit, upwardly past the rear of the grill unit, over the top of the grill unit to a front exit. The rear wall of the cavity of the microwave oven unit has a vent communicating with the duct, and the rear wall of the cavity of the grill unit has ...

One aspect of the invention is concerned with a support member for use in supporting cladding sheets. The support member includes a timber length capped by a metallic rail carrying spaced cleats. The cleats are deformable to grip the edges of cladding sheets laid over the support member, and the rail is connected to the timber over its entire length, so reinforcing the timber length. Other aspects of the invention are concerned with roof trusses in which such support members form the top chords,...

Catheter systems provide blood flow paths past a stenotic region of a blood vessel receiving treatment to restore acceptable blood flow. A catheter includes distal and proximal side orifices into a main lumen to provide a blood flow path through the catheter across the stenosis. A segmented or lobed balloon forms blood flow passages between the catheter and blood vessel wall to provide blood flow past the stenosis while the balloon is inflated. Superselective catheter systems provide means for i...

Mixing systems for liquids having fibers suspended therein wherein the fibers tenaciously adhere to and accumulate on the leading edge of the impeller, thereby increasing the drag of the liquid on the impeller as it rotates and the consequent increase in the power required to rotate the impeller. Axial flow of the liquid in a tank is produced by the impeller within a draft tube. The leading edge of the blades of the impeller are inclined with respect to radial lines extending from the axis of ro...

An antipilferage system for the detection of magnetic tags comprises an assembly (2) of spirally wound emitter (1) and/or detector (3a, 3b) coils. This arrangement enables a tag to be detected regardless of its orientation.

A method of establishing an ultrasonic standing wave in a fluid medium is described in which the standing wave is produced by an acoustic energy output along a path extending through the fluid medium, the frequency of said energy output being changed cyclically while maintaining an essentially constant mean frequency. The cyclic frequency change sweeps said energy output frequency between upper and lower limits that represent a difference of at least one half-wavelength at the mean acoustic freq...

A terminal system includes first and second terminals (7, 8 and 3a respectively). The terminals can be connected to a central equipment and the first terminals are used for a first functional mode, for example passage control, where persons allotted identification cards can insert information into the common central equipment. The first and second terminals and the central equipment are arranged for a second functional mode, which operates in parallel with the first functional mode. The messages...

A weapon system including a primary weapon arranged to be guided to a target, and further comprising at least one secondary weapon forming a unit with the primary weapon, but being releasable from the primary weapon on the approach to a target, the secondary weapon or weapons being controllable, on release, to ensure target destruction should the primary weapon not succeed in target destruction.