The present invention describes a method for estimating a position of an Access Point in a wireless communications network. Each nozzle assembly has a nozzle and an actuator for ejecting ink through the nozzle. A product produced by the process includes the material for decreasing friction comprising a petroleum lubricant containing an additive, water containing an additive, synthetic lubricant, grease, solid lubricant or metal working lubricant, wherein the synthetic lubricant, grease, solid lubricant or metal working lubricant optionally contain an additive. Also described is an electrical connector having a plurality of conductive contacts, each having a gold-coated surface for receiving a solder ball and less solder-wettable edge surfaces adjacent to the gold surface. This can be widely exposed to skin areas, or directed to discrete skin regions, particularly to areas especially susceptible to aging, e.