Disclosed is a carbon nano-tube dispersant comprising a highly branched polymer having a repeating unit represented by, for example, formula or, wherein the highly branched polymer is produced by the polycondensation of a triarylamine compound and an aldehyde compound andor a ketone compound in the presence of an acid catalyst. The circuit includes a single input port, first and second output ports, and a combination of a plurality of quarter wave transformers and a plurality of resistors coupled between the input port and the first and second output ports. The annulus pressure-sensing feature can be employed with a variety of control systems, a particular one is used as an example. The object construction code is used to create a corresponding object. A gap formed at a portion between the substrate and the closure exists from the yoke part in a direction orthogonal to a junction surface between the substrate and the closure. The tunneling device of the present invention may optionally include a rigid tunneler tip that allows for attachment of the tunneling device to a tunneler instrument prior to the implantation process.