I think the 2001 Medical Directive document is worthy of attention in the timeline. It was active for official use from May 2001 to December 2001. Then Watchtower had these documents destroyed:
http://marvinshilmer.blogspot.com/2011/02/what-happened-at-watchtower-in-2001.html
Very few originals remain of this piece of Watchtower history. I have an entire sleeve of them, including the ones for minors.