1919
•  Short-wave radio developed.
•  The Radio Corporation of America (RCA) founded.

1918
•  Edwin Armstrong develops the superheterodyne radio receiver, still the basic technology for all radios.
•  The first binary calculating machine developed.

1915
•  The first transatlantic radiotelephone call and the first transcontinental phone call made.

1913
•  Edouard Belin invents the modern fax machine, which uses ordinary phone lines.

1912
•  The Institute of Radio Engineers forms.
•  Lee deForest invents the audion tube.
•  Consumer battery sizes first standardized.
•  Woodrow Wilson first presidential candidate to record campaign speech.

1910
•  Lars and Hilda Ericsson experiment with a car telephone using long poles to connect to overhead telephone wires.