May 3 - Anti-war militants attempt to disrupt government business in Washington, D.C.; police and military units arrest as many as 12,000, most of whom are later released.
August 9 - British security forces in Northern Ireland detain hundreds of guerilla suspects and put them into Long Kesh - the beginning of an internment without trial policy. 20 die in riots that follow
November 24 - "D.B. Cooper" hijacks a plane with alleged bomb, demands and gets a ransom of $200,000 and parachutes out over the Cascade Mountains. Never caught.
... is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) by P.S.Chuang.
External links
www.gyrotwister.de ...