Question: Who designed the rollercoaster that replaced Mill Race?

<P0-S0> Raptor is a steel inverted roller coaster designed by Bolliger & Mabillard at Cedar Point in Sandusky, Ohio, United States. <P0-S1>  When built in 1994, it broke many records and held many firsts when it opened. <P0-S2>  Instead of having a short layout designed to fit into a compact area like , Raptor was designed with a larger, 3,790-foot (1,160 m) layout, making it the tallest, fastest and longest inverted roller coaster in the world when it opened. <P0-S3>  It features six inversions, including a cobra roll, a first for inverted roller coasters. <P0-S4>  At its opening, it was the largest investment in Cedar Point history. <P0-S5>  The ride is themed as a bird of prey. <SEP> <P1-S0> Painter-Bernatz Mill, also known as the Old Stone Mill, is a historic building located in Decorah, Iowa, United States. <P1-S1>  The original part of the mill was constructed by William Painter in 1851, and it was expanded to its present size in the next year or two. <P1-S2>  A mill race was constructed from a dam on the Upper Iowa River, and it was routed beneath the building to power the turbine. <P1-S3>  It was the first of at least 15 mills that used this river as its source of power. <P1-S4>  The lower two floors are composed of native limestone. <P1-S5>  The original hip roof was removed sometime between 1874 and 1890 and the present gable roof was built giving the mill a large loft. <P1-S6>  Diesel power replaced water power in 1947. <P1-S7>  The building continued to operate as a mill until 1964. <P1-S8>  It became a part of the Vesterheim Norwegian-American Museum in 1971, and houses exhibits on agriculture and industry. <P1-S9>  It is also a site in the Silos & Smokestacks National Heritage Area. <P1-S10>  The former mill is the oldest building in Decorah. <P1-S11>  It was listed on the National Register of Historic Places in 1974. <SEP> <P2-S0> Priest Mill is a historic sawmill and early electric power plant located near Franklin, Pendleton County, West Virginia. <P2-S1>  It was built in 1900, with an addition built in 1916 to house a generator and hydro-electric power plant. <P2-S2>  Electric power was generated at the mill starting in 1911, and in 1913, the Priest's home became the first in Pendleton County to have electric lights. <P2-S3>  It replaced a mill that was destroyed by fire in 1899. <P2-S4>  It is a three-story, "T"-shaped, unadorned wooden structure. <P2-S5>  originally covered with wood shingles, but these were later replaced by metal roofing. <P2-S6>  The mill race measures 988 feet from the headgates at the dam to the entrance under the mill. <P2-S7>  It operated as a wool carding mill until the 1950s, and reopened in the 1980s. <SEP> <P3-S0> Mill Race was a log flume ride that operated between 1963 and 1993 at the Cedar Point amusement park in Sandusky, Ohio. <P3-S1>  When it opened in 1963, Mill Race was only the second such log flume ride to ever operate in the world (the first being El Aserradero [The Sawmill] at Six Flags Over Texas, which had opened earlier that same year). <P3-S2>  Mill Race was ultimately removed from the park in 1993 to prepare for the opening of Raptor in 1994.