Quasar was an American company that produced and sold electronics under that brand name.  Initially, Quasar manufactured color televisions but went on to produce a line of products including air conditioners and other electronics.  In 1974, it was sold to Matsushita Electric, now known as Panasonic, who continued to produce under the brand name until 2005 when it began liquidating the assets.  Replacement parts and manuals are sometimes available via online vendors.