african american inventor who palyed a key role in improving practical electrical lighting
inventor of the electric light bulb andmany other devices
alexander graham bell
inventor of the telephone
john d rockefeller
founder of standard oil trust
a business leader who became wealthy through dishonest methods
built US steel industry
late 1800's era of fabulous wealth
government documents giving an inventor the exclusive right to make and sell an invention for a specific number of years
a business owned by investors who buy part of it through shares of stock
business that gains control of an industry by eliminating other competitors
a legal body created to hold stock in many companies, often with an industry
the pattern of good and bad economic times
an investor who buys part of a company through shares of stock
a period of low economic times
to cover with thin gold
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