Semi-conductive or insulating compositions including an ethyleneoctane or butene copolymer and at least one additional polymer, such LDPE, are described. The elongate body has a notch formed at least partially between the inner and outer surfaces and opening at a rear to the outer surface to form a thinned wall section between the notch and inner surface and a rearwardly facing projection between the notch and outer surface. Then, two n-bit ripple counters are utilized to refer to a threshold value and then receiving the positive and negative edge signal as a switch signal to reset the threshold value as an initial value of counters so as to start to count and compare to output a positive edge data bit and a negative edge data bit. The main beam includes a heavy-duty hook that enables the truck cab and bed lift tool to be lifted by an engine hoist, overhead winch, or other suitable lifting mechanism. The spring steel sheet for the support plate possesses in its foot region an uptake locking profile, in which, preferably, a round conductive core rod is engaged. Because of the architecture of the communication network, individual stations do not communicate directly with each other, but can receive broadcast messages indicating the status of each time slot, which messages are generated in the common controller and transmitted in a downstream channel.