A conductive element suitable for the transmission of an electrical operating signal to a detonator, which conductive element comprises a conductive filler homogeneously dispersed in a polymer matrix. A data transmission subsystem, operably coupled to the imaging-based code symbol reading subsystem, communicates such symbol character data to the communication interface of a host system over a communication link therebetween. The fan blade defines a chord and a maximum thickness. The central control unit can analyze and process the status or usage parameters. The first flexible substrate includes a TOSA base facing-portion facing the TOSA base, and a connection portion extending from both end portions of the TOSA base-facing portion and connected to the plurality of light-emitting elements. Laterally adjacent elements can be connected in series by intermediate wire side supports provided with transverse mounting elements extending in opposite directions and engagable in plastic display supports on both sides.