The federal definition of MI for PASRR is best understood in terms of the four âDâsâ: 1  A diagnosis or suspicion of a major mental illness such as schizophrenia, bipolar disorder, major depression, or an anxiety disorder such as OCD. 2  An absence of dementia. 3  A well-defined duration.  A particular level of disability.
Answer Wiki. The most produced tank in history is the Soviet T-54/55 Medium/Main Battle Tank. The estimations on the numbers built range from 86,000â100,000+ over the span of 1946â1983.
1916 - The first tank prototype, nicknamed mother, was created by Britain during World War 1. 1926 â Robert Goddard launches the first liquid-fueled rocket. 1935 â First flight of the DC-3, one of the most significant transport aircraft in the history of aviation; 1939 - First jet engine powered aircraft, the Heinkel He 178, takes flight.