Abstract: A modular electrical component packaging system which utilizes a plurality of identical structural elements is disclosed. The system incorporates one or more generally rectangular card cages for receiving and retaining printed circuit boards, power supplies, ventilation fans etc. Welded onto, bolted to, formed integrally on, or attached separately to two opposed sides of each rectangular card cage are a pair of identical vertically oriented channel members which serve to provide vertical support and to enclose a lock mechanism. A plurality of identical exterior panel members is provided, each including a planar surface and a pair of generally perpendicular side walls having mounting pins for coupling each exterior panel member to a pair of vertical channel members. Each exterior panel member thus overlies an entire side of the generally rectangular card cage and a portion of each side of the card cage having a vertical channel member mounted thereon.

Abstract: A method and device for detecting tooth decay by utilizing a temperature sensitive material brought into contact with a user's teeth to visibly indicate a temperature differential between teeth in close proximity to each other.