Magnateic Pan brakes have been around for years. But to buy them is very expensive. The inventor has now put a website together with both the history, working models of the hinges and a simplified version for the home builder. Below is a link to the site for those interested.
Magnabend Electro-Magnetic Sheet Metal Bending Machine (aaybee.com.au)
Magnabend Electro-Magnetic Sheet Metal Bending Machine (aaybee.com.au)