1907

Events

• The triode thermionic amplifier is invented by Lee DeForest, starting the development of electronics as a practical technology.
• June 9 - Jamestown Exposition includes the first building at any exposition devoted to aeronautics.
• December 16 - The second appendectomy is performed on a sub by Pharmacist's Mate First Class Harry B Roby.

1906

[[20th Century]] 1900s

1908