Question: Which pizzeria chain is older Russo's New York Pizzeria or Toppers Pizza?

Context articles: Joe's Pizza
Marion's Piazza
Russo's New York Pizzeria
Toppers Pizza (American restaurant)
California-style pizza
Cassano's Pizza King
Moose's Tooth Pub &amp; Pizzeria
Fox's Pizza Den
Grimaldi's Pizzeria
Rabbe Grönblom

Joe's Pizza also called Famous Joe's Pizza is a pizzeria located in Manhattan, New York City on Carmine Street near Bleecker Street.
 The restaurant is known for serving a classic New York street styled pizza.
 The pizzeria serves by the slice or by full pie.
Marion's Piazza is a pizzeria chain based in Dayton, Ohio.
 Established in 1965 by Marion Glass, the company currently operates 9 restaurants throughout the greater Dayton area.
 Marion's is renowned for its unique style of pizza, characterized by its traditional preparation and small square slices.
 The chain is intensely popular with Dayton locals and has been awarded the title of "Best Pizza" 2 times.
Russo’s New York Pizzeria is based in Houston, Texas and was established in 1992 by Anthony Russo.
 The chain serves New York-style pizza as well as several different types of soups, salads, pastas, calzones and dessert.
 They are famous for their "party pizzas," which are 2 ft in diameter.
Toppers Pizza is a chain of pizzerias in the United States.
 The chain was founded by Scott Gittrich in 1991 in Champaign, Illinois, but the original location closed in the mid-1990s.
 The first Toppers Pizza location in Wisconsin opened in Whitewater in 1993.
 The company is headquartered in Whitewater, Wisconsin.
 The first official franchise store opened in Eau Claire, WI in 1997.
California-style pizza (also known as California pizza or Gourmet pizza) is a style of single-serving pizza that combines New York and Italian thin crust with toppings from the California cuisine cooking style.
 Its invention is generally attributed to chef Ed LaDou, and Chez Panisse, in Berkeley, California.
 Wolfgang Puck, after meeting LaDou, popularized the style of pizza in the rest of the country.
 It is served in a number of California Cuisine restaurants.
 Such restaurant chains as California Pizza Kitchen, Extreme Pizza, and Sammy's Woodfired Pizza are three major pizza franchises associated with California-style pizza.
 Nancy Silverton's Pizzeria Mozza is also a popular California-style pizza restaurant in Los Angeles.
Cassano's Pizza King, currently operating under the brand Cassano's, is a pizzeria chain based in Kettering, Ohio, a suburb of Dayton.
 Established on June 4, 1953, by the Kettering grocer Victor "Vic" J. Cassano, Sr. (June 4, 1922 – January 1, 2002) and his mother-in-law Caroline "Mom" Donisi, the company currently (2005) operates 34 Cassano's Pizza King restaurants in the Dayton area, and has three other western Ohio franchises (in Russells Point, Fairfield and Sidney), plus a franchise in Quincy, Illinois, and another in Hannibal, Missouri.
 The company also operates dozens of Cassano's Pizza Express kiosks in gas stations, convenience stores and hotels, and sells frozen pizza dough under the name Cassano's Fresh Frozen Dough Company.
Moose's Tooth Pub & Pizzeria is a pizzeria and brewery located in Anchorage, Alaska currently ranked as the 3rd best pizzeria in the United States after Juliana's Pizza in New York City and Pizza Time of St. Augustine in St. Augustine, Florida.
Fox's Pizza Den is a pizzeria chain based in Murrysville, Pennsylvania, United States.
 It was founded in 1971 by Jim Fox in Pitcairn, Pennsylvania, and currently has more than 250 locations in 28 U.S. states, all franchise-owned.
 Fox's Pizza Den has consistently ranked among the Top 25 pizza chains in the world.
 The Small Business Administration named Jim Fox as one of the country's top entrepreneurs during National Small Business Week, May 5–11, 2002.
 Since that time, many Fox's Franchises have closed due to a poor business model.
 The alarming rate of failure lead to the SBA discontinuing the lending of money for Fox's Franchises.
 Fox's Pizza was ranked "Best Pizza Franchise" in 2007.
Grimaldi's Pizzeria is an American pizzeria chain from the New York City area with several restaurants throughout the United States.
 It does not sell slices, only whole pies.
 The pizzas are cooked by a coal-fired brick oven.
Rabbe Anders Grönblom (May 3, 1950 Helsinki, Finland – June 29, 2015) was a Finland-Swedish businessman who started a successful pizza business in Vaasa, Finland.
 His first company—a pizzeria—was called "O sole mio" and it was founded in 1976 in the center of Vaasa.
 From there he expanded to a pizza franchise chain first called "Pizzeria N:o 1".
 He was known as the "Pizza-emperor" (Pizzakeisari in Finnish), because he was the founder of a well known pizza franchise chain called Kotipizza which was the new name of "Pizzeria N:o 1" which expanded fast outside of Vaasa.
 The chain is said to be the biggest one in the Nordic countries.
 He was also the founder of a shipping company called RG Line, a hotel chain called Omenahotelli and another pizza chain called Golden Rax Pizzabuffet.
 Most of his companies are subsidiaries of Grönblom International LTD, where Rabbe Grönblom acted as director.
 Golden Rax Pizzabuffet however is nowadays a part of Finland's largest hotel & restaurant company Restel Oy Ltd, where Rabbe Grönblom sat on the board.
 He was also on the board of the Finnish tyre company Nokian Renkaat (since 2003).