in which country did they establish the company in the above year?
Japan.
Sega
Due to notoriety arising from investigations by the US government into criminal business practices, Service Games of Japan was dissolved on May 31, 1960. On June 3, Bromley established two companies to take over its business activities, Nihon Goraku Bussan and The two new companies purchased all of Service Games of Japan's assets. Kikai Seizō, doing business as Sega, Inc., focused on manufacturing slot machines. 
what is 'sega cd'? A  CD-ROM accessory for the Mega Drive/Genesis . which company manufactured them? Sega. name a few electronic parts of this product. The CPU is a Motorola 68000 processor,a Backup RAM cartridge, RCA pin jacks, etc. when was this product first time sold in the market? It was released in Japan on December 12, 1991. what are the different models of this product? Two preivious models developed by Sega , and the Genesis CDX,  X'Eye,  Wondermega and others. can any random music cd be played on that device? It can play CD-based games, audio CDs and CD+G discs. what games were generally played on that device? FMV video games. was this device a breakthrough or a flop? Retrospective reception of the Sega CD is mixed, praising certain games but criticizing its low value for money and limitations on the benefits it provides to the Genesis. what praises did it receive? Initially it was praised for the upgrade to Genesis and its high-quality and expanding library of games. what were the criticisms received for it? Reviewer Blake Snow noted that "The problem was threefold: the device was expensive at $299, it arrived late in the 16-bit life cycle, and it didn't do much (if anything) to enhance the gameplay experience." who founded that company that manufactured these? Martin Bromley and Richard Stewart . which year was it established? 1960.
wiki:18238737
Sega [SEP] Origins and arcade success (1940–1982)
It was exported to malls and department stores in Europe and the United States, and helped standardize the 25-cent-per-play cost for arcade games in the U.S. Sega was surprised by the success, and for the next two years, the company produced and exported between eight and ten games per year. Despite this, rampant piracy in the industry would lead to Sega stepping away from exporting its games around 1970.