Planar versions of these devices often have at least two conductors inserted into the dielectric substrate so they can act as quasi-TEM waveguides. Loading coils were developed to increase the inductance of these devices in a process sometimes called Pupinization. When conductance over capacitance equals resistance over inductance, these devices are both dispersionless and distortionless. (-5[1])These devices sometimes name the distributed-element model, which models them as a series of (*) infinitesimal resistors, inductors, shunt capacitors, and shunt resistors. A pair of coupled ODEs describing these devices were derived from that model by Oliver Heaviside. Impedance matching between these devices and their loads is aided by Smith charts. For 10 points, name these devices that transport current over long distances. ■END■ (10[1])