| Date | Event |
|---|---|
| April 01 1973 | Project Tiger Launched In India |
| April 02 1973 | Launch Of The LexisNexis Research Service |
| April 02 1973 | South Australia's Liberal Movement Breaks From League |
| April 03 1973 | First Handheld Mobile Phone Call Made By Martin Cooper Of Motorola |
| April 04 1973 | World Trade Center Officially Dedicated |
| April 04 1973 | Lockheed's Hanoi Taxi, Last Of Operation Homecoming |
| April 06 1973 | Launch Of Pioneer 11 Spacecraft |
| April 06 1973 | MLB Begins Using Designated Hitter |
| April 10 1973 | British Vickers Vanguard Crashes |
| April 17 1973 | Lucas Begins Writing Star Wars |
| April 19 1973 | Portugese Socialist Founded In German Town |
| April 30 1973 | Nixon Announces Resignations Of Haldeman And Ehrlichman |