When did snap-on start making 1/2 drive impact sockets. I was given a few that look quite old, but I cant find a date code on them anywhere. The part numbers are IP 180, IP 240, and IP-320 A. They look alot like the one in this ebay listing. Any ideas how old they are?
http://cgi.ebay.com/ebaymotors/SNAP...QQptZMotorsQ5fAutomotiveQ5fTools#ht_500wt_956
http://cgi.ebay.com/ebaymotors/SNAP...QQptZMotorsQ5fAutomotiveQ5fTools#ht_500wt_956