Question: When was the hamburger restaurant that is mentioned in the song "Fast Food Song" founded?

Context paragraphs:
Fast food in China: Western-style fast food in China is a recent phenomenon, dating back only to January 1984 when McDonald's opened its first outlet in Taipei, Taiwan Province in the Republic of China.  In October 1987, Kentucky Fried Chicken, still the most popular fast food chain in China, established its first restaurant in the People's Republic of China (mainland area), located in Beijing.  KFC was later followed by McDonald's, which remains China's number two foreign fast food option.  In addition to American style fast food, China has many local options, including a slew of restaurants that attempt to imitate fast food, particularly KFC.

Fast food restaurant: A fast food restaurant, also known as a quick service restaurant (QSR) within the industry, is a specific type of restaurant that serves fast food cuisine and has minimal table service.  The food served in fast food restaurants is typically part of a "meat-sweet diet", offered from a limited menu, cooked in bulk in advance and kept hot, finished and packaged to order, and usually available for take away, though seating may be provided.  Fast food restaurants are typically part of a restaurant chain or franchise operation that provisions standardized ingredients and/or partially prepared foods and supplies to each restaurant through controlled supply channels.  The term "fast food" was recognized in a dictionary by Merriam–Webster in 1951.

Criticism of fast food: Criticism of fast food includes claimed negative health effects, alleged animal cruelty, cases of worker exploitation, and claims of cultural degradation via shifts in people's eating patterns away from traditional foods.  Fast food chains have come under fire from consumer groups, such as the Center for Science in the Public Interest, a longtime fast food critic over issues such as caloric content, trans fats and portion sizes.  Social scientists have highlighted how the prominence of fast food narratives in popular urban legends suggests that modern consumers have an ambivalent relationship (characterized by guilt) with fast food, particularly in relation to children.

McDonald's: McDonald's is an American hamburger and fast food restaurant chain.  It was founded in 1940 as a barbecue restaurant operated by Richard and Maurice McDonald, in San Bernardino, California.  In 1948, they reorganized their business as a hamburger stand, using production line principles.  The first McDonald's franchise using the arches logo opened in Phoenix, Arizona in 1953.  Businessman Ray Kroc joined the company as a franchise agent in 1955 and subsequently purchased the chain from the McDonald brothers.  Based in Oak Brook, Illinois, McDonald's confirmed plans to move its global headquarters to Chicago by early 2018.

List of Burger King products: When the predecessor of international fast food restaurant chain Burger King (BK) first opened in 1955, its menu predominantly consisted of hamburgers, French fries, soft drinks, milkshakes, and desserts.  After being acquired by its Miami, Florida franchisees and renamed in 1954, BK began expanding its menu by adding the Whopper.  The company did not add another permanent hamburger to its menu until the introduction of the Big King sandwich in 1996 in response to McDonald's Big Mac sandwich.  The company began experimenting with premium hamburgers, made from higher quality ingredients, in 1978 with the introduction of its Specialty Sandwich product line.  The products were some of the first designed by a fast food restaurant chain that were intended to capture the adult market, members of which would be willing to spend more on a higher-quality product.  However, it wasn't until 2002 when the company began to work on a premium burger in earnest.  On the value side, Burger King first started offering sliders to its menu in the mid-1980s and offered them off and on for the next twenty years.

Winky's: Winky's Hamburgers was a chain of hamburger fast food restaurants in and near Pittsburgh, Pennsylvania that was founded by two brothers, Harold and Bernard Erenstein.  Their slogans were "Fast Food Cheap" and "Winky's Makes You Happy To be Hungry".  Their signs advertised "Winky's Hamburger 15¢"; other sandwiches offered were The Big Wink, The Great One, and The Ground Rounder.  Hot dogs also were on the menu.  One of the television commercials for the chain featured a puppet monster reading a list of signs featuring the names of the towns where restaurants were located.  Upon learning that there was no Winky's in Wilmerding, the monster ate the panel, exclaiming, "There's no Winky's in Wilmerding!"

Dee's Drive-In: Dee's Drive-In was a fast food hamburger drive-in restaurant chain based in Utah.  The chain was founded by Dee Frederick Anderson, who got his start selling hamburgers operating the Ute Hamburger Shop near the University of Utah in the 1920s.  Anderson opened the first Dee's Restaurant in 1932.  Dee's would evolve into two separate but related restaurant chains: Dee's Family Restaurant and Dee's Drive-In.

Nirula's: Nirula's is India's oldest fast food restaurant chain.  Based in North India and most popular in NCR Delhi, it was Delhi's first fast food restaurant, opening in Connaught Place in 1977.  Today it has over 70 outlets in NCR Delhi, Bihar, Haryana, Madhya Pradesh, Punjab, Rajasthan and Uttar Pradesh states, offering a “Desi” version of Western fast food items.  Nirula's success has led them to branch out into other ventures which include, ‘Potpourri’, an Indian cuisine, casual dining restaurant chain; ‘Nirula's 21’, ice cream parlour chain, in addition to pastry shops and two hotels in Noida and Panipat.  Recently Nirula's opened its first franchise in Patna, their first outlet in the entire east zone.

Fast Food Song: "Fast Food Song" is a song made famous by the British-based band the Fast Food Rockers, although it existed long before they recorded it, as a popular children's playground song.  The chorus was based on the Moroccan folk tune "A Ram Sam Sam".  It mentions the fast food restaurants McDonald's, Kentucky Fried Chicken and Pizza Hut.

Louis' Lunch: Louis' Lunch in New Haven, Connecticut, United States, advertises itself as the first restaurant to serve hamburgers and as being the oldest hamburger restaurant still operating in the U.S. Opened as a small lunch wagon in 1895, Louis' Lunch was also one of the first places in the U.S. to serve steak sandwiches.  According to Louis' Lunch, the hamburger was created in 1900 in response to a customer's hurried request for a lunch to go.  In 1917, Louis moved the business into a square-shaped little brick building that had once been a tannery.  In 1975, the restaurant was moved four blocks down to 263 Crown Street.  Hamburgers cooked in the restaurant are made on antique vertical cast iron gas stoves from 1898 and the toast made in an antique toaster from 1928.  The hamburgers are a broiled blend of five cuts of steak.  Toppings include a cheese spread, tomato or onion, but the restaurant does not offer other condiments.  Louis Lassen's restaurant is recognized in the Library of Congress as the origin of the hamburger, but other claimants and detractors exist.  The restaurant has been highly rated by Travel Channel's "Chowdown Countdown" and others, but has been the subject of criticism over condiments.

Supporting paragraphs: Fast Food Song McDonald's
Answer: 1940