| A | B |
| Granville T. Woods | improved Westinghouse's air brake and developed a telegraph system that let trains comunicate with stations |
| Samuel Morse | telegraph |
| Alexander Graham Bell | patented the telephone |
| Western Union | leading telegraph company |
| Christopher Sholes | developed the typewriter in 1867 |
| Edwin Drake | oil driller who was one of the first to drill for oil in Pennsylvania |
| Benjamin Silliman Jr. | American chemist who discovered one could refine oil from kerosene |
| Thomas Edison | inventor of the light bulb and phonograph among others |
| George Westinghouse and Nikola Tesla | developed an electric transformer |
| Andrew Carnegie | built the largest steel mill in the country |
| J.P. Morgan | banking tycoon who bought Carnegie's steel company in 1901 |
| John D. Rockefeller | oil tycoon, one of the founders of Standard Oil |
| Frank Woolworth | started a chain store in 1879 and by 1900 had a network of 59 stores. |
| Montgomery Ward | started a mail-order company |
| Marshall Field | founder of a department store in Chicago |
| R.H. Macy | founder of a department store in New York City |
| Elisha Otis | electric elevator |
| Frank Sprague & Thomas Edison | electric trolley |
| Cornelius Vanderbilt | railroads |