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  2. Self-discharge - Wikipedia

    en.wikipedia.org/wiki/Self-discharge

    How fast self-discharge in a battery occurs is dependent on the type of battery, state of charge, charging current, ambient temperature and other factors. [2] Primary batteries are not designed for recharging between manufacturing and use, and thus to be practical they must have much lower self-discharge rates than older types of secondary cells.

  3. PC LOAD LETTER - Wikipedia

    en.wikipedia.org/wiki/PC_LOAD_LETTER

    The message is encountered when printing on older HP LaserJet printers such as the LaserJet II, III, and 4 series. It means that the printer is trying to print a document that needs "Letter size" (8½ × 11 in.) paper when no such paper is available. [3] Early LaserJet models used a two-character display for all status messages.

  4. Boiler blowdown - Wikipedia

    en.wikipedia.org/wiki/Boiler_blowdown

    Bottom blowdown piping drains the lowest parts of the boiler so it can be used to drain the boiler for servicing. Bottom blowdown piping must be of a diameter large enough to minimize the risk of being plugged with baked sludge.