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Surgery is a form of medical work that involves cutting open the patient and then operating on the patient to repair a damaged part of the body.

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an instrument containing a magnetized pointer which shows the direction of magnetic north and bearings from it.

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an institution providing medical and surgical treatment and nursing care for sick or injured people.

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the part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formulas and equations.

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A specific period and region where countries like China and Japan adopted policies restricting trade and interaction with the outside world in 1434.

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The printing press was a large stamp with letters that could be moved. Ink was put on the letters and stamped onto paper. It was created in Germany in 1440.

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A steam engine that uses steam as its working fluid to perform mechanical work,converting the force of steam pressure into piston movement, which can then convert into motion.

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A Chronometer is an instrument for measuring time, especially one designed to keep accurate time in spite of motion or variations in temperature, humidity, and air pressure.

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Immunizations are the action of making a person or animal resistant to a particular infectious disease or pathogen, typically by vaccination.

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vulcanized rubber is rubber that has been treated with sulfur and heat

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A Gatling gun is a rapid-fire, crank-driven gun with a cylindrical cluster of several barrels. The first practical machine gun, it was officially adopted by the US Army in 1866.

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A lightbulb is a rounded glass container that produces light when an electric current is passed through it.

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the first fully automatic water-cooled machine gun, designed in Britain in 1884 and used especially in World War I.

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An assembly line is a series of workers and machines in a factory by which a succession of the same items is progressively assembled.