A button fastening device for attachment within an opening in a duct base for securing elongate cables and the like as well as structural duct dividers thereto. At least one of double-row inner raceways of the bearing and a wheel mounting flange are formed on a hub ring. The example gas channel plate includes a heat exchange surface including a plurality of heat exchange structures separated from one another by intervening gaps. In response to the read command, the apparatus reads data from the memory cells, and outputs data to outside of the apparatus in response to the first clock signal via the other terminal except the command terminal. The grid is oriented on the cue stick so that the main neutral line is aligned with the cue stick’s longitudinal axis. The phasor approximation circuit receives the variable envelope input signal and produces a bandlimited estimated phasor signal.