In October 1973, AT&T and Bell Canada signed an agreement stating that AT&T would no longer furnish Bell System communications and research to Bell Canada. AT&T's at-the-time chairman John DeButts explained that the main reason for this was because Bell Canada had developed its own research and development lab (Bell-Northern Research), making Bell Canada ready to serve its Canadian landline customers on its own. As a result, AT&T divested Bell Canada on June 30, 1975.