1919

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

1918

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

1915

• The first transatlantic radiotelephone call and the first transcontinental phone call are 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 are standardized. 
• Woodrow Wilson becomes the first presidential candidate to record a campaign speech.

1910

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