31. Assembly Line
Eli Olds invented the basic concept of the assembly line and Henry Ford improved upon it.
32. AstroTurf
A patent for synthetic grass-like playing surfaces or Astroturf was issued to Wright and Faria of Monsanto Industries.
33. Atari Computers
The history of the entertaining video game console.
34. ATM - Automatic Teller Machines
The history of automated teller machines (ATM).
35. Atomic Bomb
In 1939, Einstein and several other scientists told Roosevelt of efforts in Nazi Germany to build an atomic bomb. It was shortly thereafter that the United States Government began the Manhattan Project, whose research produced the first atomic bomb.
36. Atomic Clock
The US primary time and frequency standard is a cesium fountain atomic clock developed at the NIST laboratories.
37. Audio Tape Recording
Marvin Camras invented the method and means of magnetic recording.
38. Auto-Tune
Dr Andy Hildebrand is the inventor of the voice pitch-correcting software called Auto-Tune.
39. Automated Electrified Monorail Systems
Ronald Riley invented the automated electrified monorail system.
40. Automatic Doors
Dee Horton and Lew Hewitt invented the sliding automatic door in 1954.
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