From the collection Dr. David P. Chandler on the site http://papaintellivision.com/
The documents herein regard the Mattel Electronics Intellivision project ranging from its inception in 1977 until the end of Chandler's involvement with the company in 1983.
This catalog displays the major product line for Mattel Electronics in 1979, at this time still only consisting of electronic handhelds. The last page notes that it was copyrighted in April of 1979.
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