Abstract: A device for indicating whether a container having a cap has been opened. The device includes a switch or pressure transducer for detecting the engagement of the cap to the container and disengagement therefrom. A display, which is visible through the top of the cap, provides a plurality of messages which are in an irreversible and nonrepeatable sequence for indicating whether or not the cap has ever been removed from the container.

Abstract: The present invention relates to a means for extending an electrical circuit through a modular assembly comprising a plurality of threaded pipe modules which utilizes electrical contact strips. In particular, the circuit is extended through a system of interengagable outer pipe modules, adapted for use with one another, and for use with any of a plurality of inner pipe modules. Each of the modules is preferably a length of pipe having at least on its interior electrically insulating material and electrically conductive strips in a fixed spatial relationship. A precisely threaded coupling is formed on at least one end of the pipe having a single starting point for engagement with another precisely threaded coupling on another outer module.