An OLED device having a conductive layer patterned by pillars to form electrodes in the device is disclosed, wherein portions of the pillars have at least 2 sub-rows to prevent shorting of adjacent electrodes. The power amplifier compares an input signal power against a sampled component of an output power, and provides predistortion to the input signal power so as to minimize a difference as a result of the comparison. A pipe locator in the form of two projections, projects perpendicularly outwardly from each side of the spacer for concentric alignment of piping components on opposing sides of the spacer when abutted with the respective pipe locators. The first and second housing parts are joined together. The pin or pins may be manipulated to immobilize the first and second portions of the fractured vertebra. As co-users logon and logoff, a user’s buddy list is updated to reflect these changes.