Question: What years did the hotel and casino operated that Jack Entratter manage positions for in Las Vegas?

Context articles: Carl Cohen (businessman)
Westgate Las Vegas Resort &amp; Casino
Sands Hotel and Casino
Tropicana – Las Vegas Boulevard intersection
El Rancho Vegas
Corey I. Sanders
Holy Cow Casino and Brewery
Monte Carlo Resort and Casino
Jack Entratter
The Palazzo

Carl Cohen (February 15, 1913 – December 26, 1986) was an American businessman.
 He was a well-known executive in the gambling resort industry in Las Vegas, Nevada, in the 1940s through 1970s and is credited with playing an important role in the development of Las Vegas as a premier resort destination.
 He began his career as a bookie and operator in illegal gambling clubs operated by the Mayfield Road Mob in Cleveland, Ohio.
 Moving to Las Vegas, he became casino manager for the El Rancho Vegas in the 1940s and the Sands Hotel and Casino in the 1950s; he also had a controlling interest in both resorts.
 He advanced to senior vice president of the Sands and, in 1973, became senior vice president of the newly opened MGM Grand Hotel.
 He gained national notoriety for a 1967 altercation with Frank Sinatra at the Sands, in which he responded to the singer's drunken and aggressive behavior by punching him in the mouth and knocking the caps off his front teeth.
The Westgate Las Vegas Resort & Casino is a hotel and casino in Winchester, Nevada.
 It is owned by Westgate Resorts and operated by Navegante Group.
 It has 2,956 hotel rooms including 305 suites.
 It opened in 1969 as the International Hotel, and was known for many years as the Las Vegas Hilton, then briefly as the LVH – Las Vegas Hotel and Casino.
 It was renamed the Westgate Las Vegas on July 1, 2014.
The Sands Hotel and Casino was a historic hotel and casino on the Las Vegas Strip in Nevada, United States, that operated from 1952 to 1996.
 Designed by the architect Wayne McAllister, with a prominent 56 ft high sign, the Sands was the seventh resort to open on the Strip.
 During its heyday, the Sands was the center of entertainment and "cool" on the Strip, and hosted many famous entertainers of the day, most notably the Rat Pack.
The Tropicana – Las Vegas Boulevard intersection on the Las Vegas Strip (Tropicana Avenue and Las Vegas Boulevard), is noteworthy for several reasons.
 It was the first intersection in Las Vegas completely closed to street level pedestrian traffic and its four corners are home to four major resorts: Excalibur Hotel and Casino, Tropicana Las Vegas, New York-New York Hotel and Casino and MGM Grand Las Vegas—the latter has 5,044 rooms and was once the largest hotel in the world.
 The resorts at the four corners have a total of 12,536 hotel rooms as of 2016.
El Rancho Vegas was a hotel and casino on the Las Vegas Strip.
 It was located at 2500 Las Vegas Boulevard, at the southwest corner of Las Vegas Boulevard and Sahara Avenue, and opened on April 3, 1941.
 Until 1942, it was the largest hotel in Las Vegas with 110 rooms.
 On June 17, 1960, the hotel was destroyed by fire.
 In 1982, the El Rancho Hotel and Casino formerly known as the Thunderbird and later as the Silverbird opened across the street from the former site of the El Rancho Vegas, creating some confusion.
Corey Sanders has served as Chief Operating Officer of MGM Resorts International since June 2010.
 He oversees operations at the Company’s wholly owned properties, which in Nevada include Bellagio (resort), MGM Grand Las Vegas, Mandalay Bay, The Mirage, New York-New York Hotel and Casino, Monte Carlo Resort and Casino, Luxor Las Vegas, Excalibur Hotel and Casino, Circus Circus Las Vegas, Circus Circus Reno, Gold Strike Jean and Railroad Pass Casino.
 He also oversees Beau Rivage (Mississippi) in Biloxi and Gold Strike Tunica, both in Mississippi, as well as MGM Grand Detroit.
Holy Cow!
 Casino and Brewery (formerly Foxy's Firehouse) was a locals casino and microbrewery on South Las Vegas Boulevard, north of the Las Vegas Strip, in Las Vegas, Nevada.
 The property began in 1955 as Foxy's Deli, which operated until its closure in 1975.
 A year later, the building was reopened as a casino named Foxy's Firehouse, which later closed in 1988.
 Tom "Big Dog" Wiesner purchased the building and reopened it as the Holy Cow casino in 1992.
 Wiesner added a microbrewery the following year, making the Holy Cow the first brewery to open in Las Vegas.
 Wiesner persuaded the state to change its laws that had prohibited breweries from operating in Las Vegas.
The Monte Carlo Resort and Casino is a megaresort hotel and casino on the Las Vegas Strip in Paradise, Nevada, United States.
 The hotel, with a height of 360 ft , has 32 floors, featuring a 102000 sqft casino floor with 1,400 slot machines, 60 table games, and 15 poker tables.
 It is owned and operated by MGM Resorts International.
 The hotel offers 2,992 guest rooms, including 259 luxury suites.
 It is being converted from late 2016 to 2018 into the Park MGM, with the upper floors converted into a boutique hotel, NoMad Las Vegas.
Jack Entratter (February 28, 1913 – March 11, 1971), nicknamed "Mr. Entertainment", was an American business executive.
 He is best known for management positions at the Copacabana nightclub in New York City in the 1940s and early 1950s, and at the iconic Sands Hotel and Casino in Las Vegas from the early 1950s.
 He is closely associated with Frank Sinatra and the Rat Pack in the history of Las Vegas, Nevada.
The Palazzo is a luxury hotel and casino resort located on the Las Vegas Strip in Paradise, Nevada.
 It is the tallest completed building in Nevada.
 Designed by the Dallas based HKS, Inc., the hotel offers luxury in an Italian Renaissance ambiance.
 The hotel and casino are part of a larger complex (operated as one hotel) comprising the adjoining Venetian Resort and Casino and the Sands Convention Center, all of which are owned and operated by the Las Vegas Sands Corporation.