Inventions of the 20s...And beyond
Inventions of the Ragtime Era

Inventors and Inventions from 1901 to 1950: The First Half of the Twentieth Century

List of inventions through the ages

Technology Timeline: 1752 - 1990

Interactive Technology Timeline

Inventions 1900-1990 (some are hyperlinked to more info)

Scientific inventions 1990-1990 alphabetical list of inventions

Inventors profile - Edwin Howard Armstrong

Invention: Washing Machine