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.
There are so many earthquakes in Japan because the country is in what is called the Pacific Ring of Fire which is an area where large numbers of earthquakes and volcanic erupt â¦ ions occur in the basin of the Pacific Ocean.apan has earthquakes and volcanoes because the Pacific and Philipines plates underneath the Eurasian platesare losing water to the mantle rocks as they go down. it cause the â¦ mantle rock to melt, it form volcanoes from magma. the earthquakes are caused by plates scraping against each other.