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  2. Diving regulator - Wikipedia

    en.wikipedia.org/wiki/Diving_regulator

    A diving regulator or underwater diving regulator is a pressure regulator that controls the pressure of breathing gas for underwater diving.The most commonly recognised application is to reduce pressurized breathing gas to ambient pressure and deliver it to the diver, but there are also other types of gas pressure regulator used for diving applications.

  3. Premium-rate telephone number - Wikipedia

    en.wikipedia.org/wiki/Premium-rate_telephone_number

    Premium-rate telephone numbers are telephone numbers that charge callers higher price rates for select services, including information and entertainment. A portion of the call fees is paid to the service provider, allowing premium calls to be an additional source of revenue for businesses.