Anything interesting here? These patents are from 1995 and 2005 respectively, but couldn't find anything on this forum. Apologies if I missed anything, or if these are nothing of interest:
http://www.freepatentsonline.com/5636813.html
http://www.freepatentsonline.com/y2007/0028594.html
http://www.freepatentsonline.com/5636813.html
http://www.freepatentsonline.com/y2007/0028594.html