Question: Where was the game manufacturer who introduced RSVP based?

Context articles: Grandstand (game manufacturer)
Selchow and Righter
Isis Adventure
RSVP (board game)
Milton Bradley Company
Dofus
Family Soft
List of Sega video game consoles
Data East USA, Inc. v. Epyx, Inc.
Wahoo (board game)

Grandstand (also known as Grandstand Leisure Products) was a video game console and electronic game manufacturer and distributor.
 It was based in the United Kingdom and New Zealand and was active in the 1970s and 1980s.
Selchow and Righter was a 19th- and 20th-century game manufacturer best known for the games "Parcheesi" and "Scrabble".
 It was based in Bay Shore, New York.
Isis Adventure is a series of puzzle games presented by Sonic Games, a Shropshire-based business.
 The game involves opening physical puzzle boxes made of precision-engineered anodized aluminum to reveal unique codes that can be redeemed for prizes or to reveal further clues.
 The game began in September 2006.
 The game manufacturer's website contains a list of names it claims to be prize winners.
RSVP was a vertical version of "Scrabble" introduced by Selchow and Righter in 1958 and promoted as "3-D Scrabble".
 Two players spelled words using cubical tiles with letters on an upright grid board.
The Milton Bradley Company was an American board game manufacturer established by Milton Bradley in Springfield, Massachusetts, in 1860.
 In 1920, it absorbed the game production of McLoughlin Brothers, formerly the largest game manufacturer in the United States.
Dofus is a Flash-based tactical turn-oriented massively multiplayer online role-playing game (MMORPG) developed and published by Ankama Games, a French computer game manufacturer.
 Originally released solely in French, it has since been translated into many other languages.
 It is primarily a pay-to-play game, though it still offers a limited amount of free content.
 Its success has led to the marketing of spin-off products, such as books, art, comics and a movie released in 2016.
 It has also led to the development of two continuations: "Dofus Arena", released at the beginning of 2006, which is an alternative "tournament" version of "Dofus"; and "Wakfu", a continuation of "Dofus".
 The game has attracted over 25 million players worldwide and is especially well known in France.
 Today, there are more than 1.5 million subscribers every month on this game.
FamilySoft Co.,Ltd. (株式会社ファミリーソフ ) is a Japanese company founded in 1987 and headquartered in Nerima, Tokyo.
 Since its establishment, FamilySoft are carrying on business in the field of game development and publishing.
 They develop and publish mainly adventure, fighting, gyaruge, and war games.
 Some of the "Mobile Suit Gundam" and "Macross" titles were produced by the company.
 FamilySoft also produced games based on other anime like "Area 88", "Crusher Joe", "Aura Battler Dunbine", "Armored Trooper Votoms" or "Science Ninja Team Gatchaman".
 In 1992, FamilySoft also established an adult game manufacturer, .
Sega is a video game developer, publisher, and hardware development company headquartered in Tokyo, Japan, with multiple offices around the world.
 The company has produced home video game consoles and handheld consoles since 1983; these systems were released from the third console generation to the sixth.
 Sega was formed from the merger of slot machine developer Service Games and arcade game manufacturer Rosen Enterprises in 1964, and it produced arcade games for the next two decades.
 After a downturn in the arcade game industry in the 1980s, the company transitioned to developing and publishing video games and consoles.
 The first Sega console was the Japan-only SG-1000, released in 1983.
 Sega released several variations of this console in Japan, the third of which, the Sega Mark III, was rebranded as the Master System and released worldwide in 1985.
 They went on to produce the Genesis—known as the Mega Drive outside of North America—and its add-ons beginning in 1988, the Game Gear handheld console in 1990, the Sega Saturn in 1994, and the Dreamcast in 1998.
Data East USA, Inc. v. Epyx, Inc. 862 F.2d 204, 9 U.S.P.Q.2d (BNA) 1322 (9th Cir.
 1988) is a court case in which Data East, a video game manufacturer, contended that Epyx, a competing video game manufacturer, licensed and distributed a video game, "International Karate", that infringed on the copyright of a video game developed by Data East, "Karate Champ".
 After a district court sided with Data East, the United States Court of Appeals for the Ninth Circuit court on appeal reversed the decision of copyright infringement.
 This judgment was based on the lack of "substantial similarity" between the games, because the identified similarities were inherent to all karate video games.
Wahoo is a cross and circle board game similar to "Parchisi" that involves moving a set number of marbles around the board, trying to get them into the safety zone.
 The game originated in the Appalachian hills.
 Most boards are used by four to six players.
 "Wahoo" has been a popular game for decades.
 Even today, custom-made boards proliferate on eBay and game manufacturer Parker Brothers has sold their own version of the game, under the title "Aggravation", for decades.