Here is my latest Utility Knife purchase, that I picked up at the flea market for a buck. I had no idea what it was, but had to have it because I collect old unusual U.S.A. tools. It has a patent number of 300,600, but that did not compute in Google pats., or Datamp. So, I finally found it using keywords "Long Utility Knife". It is Called a "PipeKnife", designed by techs in the Auto Glass Industry, in the 1980's. Mine is the 14 inch version, and they have one 18 inches long. It has the same utility knife blade reciever as the standard knife, and there are several nasty looking blades that can be used on it. I can see some applications, other than glass gasket removal, that I could have used it on several times, but never knew it existed.
Wayne