and railroad, including the National Sewing Machine Company, which operated here from 1886 to the 1940s. In 1906, former female sheriff Sarah Ames moved to South Dakota; she named the area where she settled after her home town. Belvidere, South Dakota still operates as a small town in Jackson County. 1967 tornado On April 21, 1967, a devastating tornado struck Belvidere. Twenty-four people died as a result, many of them schoolchildren. The F4 tornado struck at the end of the school day of Belvidere High School, when many children, including those who attended area grade schools, were waiting outside the high school for school buses. Of the sixteen school buses outside the high school, twelve were overturned or thrown by the tornado. The tornado did $22 million in damage, demolished over 100 homes, and injured 500 people. In 2007 a statue was erected in front of Belvidere High School in memorial of the lives lost. To this date, the Belvidere tornado remains the 6th worst weather disaster to happen at an American School. 2009 explosion On December 7, 2009 an explosion occurred at an NDK America building, when a large pressure vessel ruptured during a crystal-growing process. Pieces of debris, some weighing several tons, were flung over a wide area. One piece struck an automotive supply building and injured an employee inside. Chesterfield native Ronald Greenfield, a truck driver refueling at the nearby Belvidere Oasis truck stop, was struck and killed by a 7-foot support beam. The shockwave was felt over a wide area. No NDK employees were injured in the incident. The Chemical Safety Board investigated the incident, issuing their final report in 2013. The CSB found that stress corrosion cracking had occurred, unnoticed, in one of the crystal-growing autoclaves, leading to the catastrophic failure. They also found that NDK management had been warned multiple times over the years that the dangerous levels of hot sodium hydroxide inside the vessels would corrode the steel walls. However, NDK management insisted buildup of byproducts from the crystal-growing process would form a protective layer against the corrosion. Furthermore, during the factory's construction, the local government had been made aware that NDK's crystal-growing vessels were in violation of several state codes; when confronted, NDK had persuaded them to grant a special exception, and to hitherto allow them to conduct their own onsite inspections without outside interference. However, the vessel that ruptured had never