An apparatus for selectively positioning intraoral anatomic features of a human patient to enhance upper airway stability for use alone or in combination with positive airway pressure as therapeutic treatment for obstructive sleep apnea and other conditions, such as snoring, which are symptomatic of upper airway instability. The discharge vessel encloses a discharge space comprising an ionizable gas filling and, in addition to Hg, also an alkali iodide of Na or Li or a combination of both. The database stores financial transaction data relating to financial transactions performed using the financial transaction instrument. Other methods, systems, and machine-readable media are also described. The guide mechanism guides the slider when the slider is displaced along the frame.