What invention is used to communicate over short or long distances?
What is the telephone?
A government document allowing inventors to sell their inventions for a certain amount of years.
What is a Patent?
He invented the telephone.
Who is Alexander Graham Bell?
What is used to light up what is dark?
The pattern of good and bad times.
What is the Business Cycle?
Who invented the light bulb?
Who is Thomas A. Edison?
This machine is used to create energy.
What is a generator?
What is the Centennial Exhibition?
Who invented the photograph?
Who is Thomas A. Edison?
A new manufacturing technique used in the 1850s.
What is the Bessemer Steel Process?
Who invented a leather to the sole machine?
Who is Jan Matzeliger?
A cheap oily liquid.
What is petroleum?
Who invented the moving picture viewer?
Who is Tomas A. Edison?