Batteries i think.
He invented many stuff
Thomas Watson
He invented the first mechanical adding machine.
inventions of thomas Watson sr.
Thomas Watson was born on January 18, 1854.
Thomas Watson died on December 13, 1934.
Thomas Watson - poet - died in 1592.
Thomas Lennox Watson was born in 1850.
Thomas Lennox Watson died in 1920.
Thomas A. Watson was born on January 18, 1854.
the radar
No Thomas Edison didn't invent the umbrella, but he did invent the phonograph and the light-bulb. :D