Abstract: A pair of tangle resistant electrical test leads, the pair having a first and a second conductor attached to a nonconductive slide fastener, such as a nylon zipper. The first and second conductors are surrounded by loop and hook material. The loop material is attached to the upper side of a first border of the zipper and the hook material is attached to the under side of the second border of the zipper. In a zipped state, the leads remain parallel and of uniform separation, thus eliminating entanglement of the individual leads. When the zipped leads are wrapped about a meter or other test instruments, the loop and hook material secures the wrapped leads upon themselves, in a half-lapped wrapping, thus preventing entanglement of the joined leads. During usage of the electrical test leads, when their full length is not required, the tangle electrical test leads can be unwrapped and unzipped only as much as needed, thereby keeping the leads neater and reducing the likelihood of entanglement.

Abstract: A special rear vision mirror device and installation which provides and utilizes a continual safety monitoring of the angular relationship between the pivotally-connected tractor and trailer vehicle units of a "semi" (tractor/trailer tandem-connected vehicles). The overall mirror installation, during a semi's turning maneuver, automatically rotates the mirror in a special relation and correspondence to what at each increment of the turn is the angular relation of the tractor and trailer, particularly the angular changes from a straight (in line) tandem vehicle relation, occurring while the semi is in the turning maneuver. This provides, continuously, a controlled, and as needed, continuously-adjusted safety setting for the mirror, such that the driver's safety-needed vision of the trailer's rear portion and rear wheels is viewable through the mirror; thus the driver's vision during a turn is permitted and provided by the mirror to be that of maximal safety.