Wacom's CEO Masahiko Yamada gave this account of Wacom's history: https://www.paintboxtv.com/wp-content/uploads/2012/11/2009-08-Wacom_Art_of_Making_Marks_About_How_It_All_Started.pdf
This blog post is also a good summary of the history: https://historyofthearttablet.wordpress.com/ This document also contains a number of links.
See also this doc: https://www.billbuxton.com/inputTimeline.html
Is you want to see a list of drawing tablets from Wacom go here: Wacom tablet list