Abstract: An electric heating element, particularly of the cartridge type, comprising two elongated dielectric cores disposed within a metallic sheath. Each core has a plurality of longitudinally extending openings therein and more particularly one core has three longitudinal openings whereas the other has two openings. A resistance wire coil is wound on each of the cores, each coil having longitudinally spaced terminals. Three metal pins fit into predetermined core openings; one of the terminals of each resistance coil is electrically connected to one pin, the opposite terminal of one resistance coil is electrically connected to a second pin; and the opposite terminal of the other resistance coil is electrically connected to the third pin; whereby the one pin serves as a common electrical connection for both resistance coils, and the second and third pins serve as separate electrical connections to the respective resistance coils, whereby separate circuits may be established within the heating element.

Abstract: A circuit assembly as for an attenuation circuit is constructed upon a glass or ceramic substrate. T-element attenuators are formed on one face of the substrate by a film-circuit technique. Connections to electrodes of the T-element resistances are made by contact elements having clamping portions which engage an edge of the substrate to overlie the respective electrodes. One side of each contact element is extended from the clamping portion to form a contact arm having a forked end spaced adjacent the face of the substrate. The electrodes and contact elements are spaced apart longitudinally of the substrate and the contact arms alternate longitudinally between front and back faces thereof. Wire bridge connections are then readily made between successive arms on one or the other side of the substrate to turn on or off the individual T-element attenuator.