On this day: April 3

POSTED: 03:52 PM PDT Mar 29, 2013    UPDATED: 11:00 PM PDT Apr 02, 2014 

The Pony Express begins, outlaw Jesse James is killed, the convicted Lindbergh baby kidnapper dies in the electric chair, the Unabomber is captured, and Iowa legalizes gay marriage, all on this day.

OTD April 3 - Martin Cooper
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Rico Shen/Wikimedia Commons

1973: Martin Cooper of Motorola makes the first handheld mobile phone call to Joel S. Engel of Bell Labs, his chief competitor, using the prototype DynaTAC phone. That public demonstration landed the DynaTAC on the July 1973 cover of Popular Science magazine. However, it would take another 10 years for a version of the phone to become the first cell phone to be commercially released. Cooper is seen here re-enacting that first mobile phone call in 2007.

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