A method of forming tapered channels for scissors jack

Year	Description
1993	Invention patented by Darryl L. Engel on March 30th, 1993. Abstract: A method of forming a tapered channel for a jack which uses less material comprising forming curved openings in the center portion of the channel and then stretching the middle portion of the channel so that it is tapered to produce a tapered channel.
Source: selected by the editor from original sources.

Invention: A method of forming tapered channels for scissors jack