Patent ID: 7927106

Claim:
An apparatus comprising: a first cylinder having a first number of conductive segments located on an outer surface of the first cylinder, wherein the first number of conductive segments is configured to conduct first signals, and the first cylinder has an axis of rotation extending through the first cylinder; a second cylinder having a second number of conductive segments located on an inner surface of the second cylinder, wherein the second number of conductive segments is configured to conduct the first signals, the second cylinder has the axis of rotation, and the first cylinder is located inside the second cylinder such that the first number of conductive segments remains in communication with corresponding ones of the second number of conductive segments during rotation of the first cylinder and the second cylinder relative to each other; a third cylinder having a third number of conductive segments located on an outer surface of the third cylinder, wherein the third number of conductive segments is configured to conduct second signals, the third cylinder has the axis of rotation extending through the third cylinder, and the second cylinder is located inside of the third cylinder; and a fourth cylinder having a fourth number of conductive segments located on an inner surface of the fourth cylinder, wherein the fourth number of conductive segments is configured to conduct the second signals, the fourth cylinder has the axis of rotation, and the third cylinder is located inside the fourth cylinder such that the third number of conductive segments remains in communication with corresponding ones of the fourth number of conductive segments during rotation of the third cylinder and the fourth cylinder relative to each other.