Where ring terminals come from

It turns out that ring terminals and other crimp lugs are made by tyco. The model name is plasti-grip.

Here is an application note for the tooling:
http://ecommas.tycoelectronics.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Specification+Or+Standard%7F114-2161%7FA%7Fpdf%7FEnglish%7FENG_SS_114-2161_A.pdf

Here is the root of the search tree for the tyco model number:

http://www.tycoelectronics.com/catalog/feat/en/s/10334?BML=10000-P