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An early major application of compressed air was in the drilling of the Mont Cenis Tunnel in Italy and France in 1861, where a 600 kPa (87 psi) compressed air plant provided power to pneumatic drills, increasing productivity greatly over previous manual drilling methods. Compressed-air drills were applied at mines in the United States in the 1870s.
This is a list of airlines that have an air operator's certificate issued by the Federal Aviation Administration of the United States.. Note: Destinations in bold indicate primary hubs, those in italic indicate secondary hubs, and those with regular font indicate focus cities.
Some types are also referred to as a compressed air breathing apparatus (CABA) or simply breathing apparatus (BA). Unofficial names include air pack, air tank, oxygen cylinder or simply pack, terms used mostly in firefighting. If designed for use under water, it is also known as a scuba set (self-contained underwater breathing apparatus).
Service stations and auto repair shops use compressed air to fill pneumatic tires and power pneumatic tools. Fire pistons and heat pumps exist to heat air or other gasses, and compressing the gas is only a means to that end. Rotary lobe compressors are often used to provide air in pneumatic conveying lines for powder or solids.
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