The side lengths of a right triangle form a so-called Pythagorean triple. A triangle that is not a right triangle is sometimes called an oblique triangle. Special cases of the right triangle include the isosceles right triangle (middle figure) and 30-60-90 triangle (right figure).
The first pacemaker was implanted on 8th October 1958 in a 43 year old man called Arne Larsson with complete heart block and Stokes-Adams attacks. Technological innovations between 1973 and 1980 rendered obsolete the reliable pacemaker of 1970.
Accession Number: AV 2001.104.3. Earl E. Bakken was born and educated in Minnesota. He started Medtronic Inc. and has developed many medical devices including the first battery operated pacemaker and one of the first implantable pacemakers. He founded the Bakken Library and Museum in Minneapolis.