Abstract: A polymeric positive temperature coefficient (PTC) material useful as a component of a device for disposing electrical current into a conductive liquid while heating the liquid and regulating its temperature to a useful range, such as for a domestic hot water supply. In addition it can do so without inhibiting previously expected corrosion and build up of insoluble deposits.

Abstract: An air scoop screen is used in the incoming end of an automotive air intake to prevent the ingestion of rocks or debris thrown up by preceding vehicles. A rectangular fiberglass screen is folded outward along its edges to form a rectangular screen with rectangular edges about 90 degrees to the screen body. Rigid reinforcements may be placed inside the edges and secured to a Velcro fastener and to the screen edges to assist in maintaining the rectangular shape. A hook-type Velcro fastener is bonded to the inside of the intake scoop near its front end. The screen is inserted in the air scoop and, with the fingers on the inside of the edges, the Velcro fastener attached to the screen is pressed into the Velcro fastener bonded on the inside of the air scoop.