A carriage with a recording head mounted therein is movably supported by a first guide member extending in a direction intersecting with a recording medium transport direction \u201ca\u201d. Also disclosed are composite materials, comprising a porous support and a porous nanoweb. This considerably reduces the weight volume and cost of the overlaid POTS and xDSL circuits. The polling manager uses an efficient \u201cjust in time\u201d polling of stations based on their allocated bandwidth or communication rates. The improved apparatus includes processor-controller, pump, specimen flowmeter, and the selectable channel specimen flow system comprising the channel valving device, filters, and particle monitor. It is not necessary for the concentric tubes to display adhesive-, chemical- or sinter-bonding to each other in order to achieve a strong bond.