This Day in Geek History: January 15
1907
Dr. Lee De Forest patents the three-element vacuum tube, the Audion tube. (US No. 841,386) The component can be used as an electrical signal amplifier, most notably in radios.
1913
The first telephone line between Berlin and New York is inaugurated.
1936
In Toledo, Ohio, construction of the first building covered completely in glass is completed for the Owens-Illinois Glass Company.
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