Abstract: An electronic token system including a token receptacle and a portable token. The token receptacle includes a receptacle body with an outer surface having a first, generally planar array of electrical contacts, which are arranged in a dense-packed configuration that minimizes the surface area occupied by the planar array, consistent with sufficient electrical separation between adjacent contacts. The token receptacle also includes a first alignment feature and a first retention feature. The portable token includes an enclosure for enclosing at least a portion of the receptacle body, the enclosure having a second alignment feature for mating engagement with the first alignment feature and a second retention feature for holding the portable token in removable connection with the first retention feature. The token also includes a second, generally planar array of electrical contacts for electrical communication with the corresponding electrical contacts of the first planar array mounted in the token receptacle.

Abstract: Time domain reflectometers are described that include a sensor circuit, a feed line, a lead line, and a signal generator. The feed line and lead line are configured such that when a signal propagates through the feed line and the guide line at least one of the reflected signals of the plurality of reflected signals is delayed beyond full measurement range of the apparatus so as to prevent the reflected signal from being possibly sensed.

Abstract: This document discusses, among other things, backlit apparatuses and methods therefor. In an example, an apparatus includes a backlit apparatus for controlling an end device. A housing has an opening in a front end of the housing. An actuation unit is attached to the housing. The actuation unit is coupled to the end device and configured to at least partially control the end device. A light source unit is disposed within the housing. The light source unit is configured to emit light within the housing. A light member is disposed at the opening in the housing. The light member includes properties configured to transmit the light emitted by the light source unit. The light source unit and the light member are configured to provide backlighting of the apparatus. In another example, a method includes cost-effectively providing backlighting to such an apparatus.