Here are four typed pages of "Findings Of Fact" in a legal action between Magnavox v. Activision No. C-82-5270-CAL in the United States District Court - Northern District of California. Dated, but hard to read date, likely circa 1986 - 1988.
Here are 20+ pages of Activision News Releases announcing various games, including their first games.
There is also a nice 8 x 10 black and white photo of the Activision team.
The label on the back of the photo states:
ACTIVISION'S FOUNDING GROUP - PRESIDENT JIM LEVY (foreground) and SENIOR DESIGNERS (left to right) BOB WHITEHEAD, DAVID CRANE, LARRY KAPLAN AND ALAN MILLER.