The Wright brothers patent war centers on the patent they received for their method of an airplane's flight control. The Wright brothers were two Americans who are widely credited with inventing and building the world's first flyable airplane and making the first controlled, powered and sustained heavier-than-air human flight on December 17, 1903.[1][2][3]
The primary difference between barter and currency systems is that a currency system uses an agreed-upon form of paper or coin money as an exchange system rather than directly trading goods and services through bartering.
Please v. Ferguson
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Answer:
C
Explanation:
the Roman empire exists of France, Greece and Great Britain
