Before revision: Diodes Fleming's first diodes At the end of the 18th century, radio or wireless technology was in an early stage of development and the Marconi Company was engaged in development and construction of radio communication systems.
After revision: Diodes Fleming's first diodes At the end of the 19th century, radio or wireless technology was in an early stage of development and the Marconi Company was engaged in development and construction of radio communication systems.