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2. Sales taxes in the United States - Wikipedia

   en.wikipedia.org/wiki/Sales_taxes_in_the_United...

   Qualifying food, drugs, medicines and medical appliances [103] have sales tax of 1% plus local home rule tax depending on the location where purchased. Newspapers and magazines are exempt from sales tax as are legal tender, currency, medallions, bullion or gold or silver coinage issued by the State of Illinois, the government of the United ...

3. Diving cylinder - Wikipedia

   en.wikipedia.org/wiki/Diving_cylinder

   The pressure vessel is a seamless cylinder normally made of cold-extruded aluminum or forged steel. [5] Filament wound composite cylinders are used in fire fighting breathing apparatus and oxygen first aid equipment because of their low weight, but are rarely used for diving, due to their high positive buoyancy.

4. Horsepower - Wikipedia

   en.wikipedia.org/wiki/Horsepower

   Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower.