The Letter Series and the Golden Years of IH. The F-series tractors lasted until 1939. In late 1939, the famous Letter series of Farmall tractors was introduced. The model name letters were A, B, BN, C (which replaced the B and BN in 1948), H, M, and MD(M diesel).
Japan has had a long history of earthquakes and seismic activity. It is an area of high seismicity because it is located near major tectonic plate boundaries and is situated on the Pacific Ring of Fire.n July 16, 2007, an earthquake measuring 6.6 M, the 2007 ChÅ«etsu offshore earthquake hit about 29 kilometres (18 mi) west of Niigata in the northwest Niigata region of Japan. ) was a powerful magnitude 6.6 earthquake The earthquake shook Niigata and neighbouring prefectures.
In Japan, for example, in the early 1990s, many seismologists suggested that the Great Kanto earthquake of 1923 (a magnitude-8.2 quake that killed more than 140,000 people in Tokyo and Yokohama) would repeat itself sometime in the mid-1990s to the early-2000s based on a 70- to 80-year cycle.