Many years ago I came across a bunch of paper work and memorabilia from a Pennsylvania Harley Dealership from the late 50's into the 70's.
Amongst the stuff was this Mechanic's folder with cutouts and instructions for performing his day to day job. There is a ton of cool stuff in this folder, however, the most interesting piece to me is this hand drawn dual Duo-Glide motorcycle powered vehicle that this fellow must have dreamed up after countless hours in the shop. It appears to be a sidecar body with a modified Duo-Glide attached on either side and a pivoting leaf spring suspension/steering design. Obviously in the early stage of conception ...Amazing.