The Tange aero tubing was designed with Shimano in the early 80s to build aero framed bikes. Other manufacturers made aero tubing, but no one specifically teamed up with a component maker. Reynolds had their "slipstream" tubing and Columbus had a version too.
I currently am building a framset with the Tange tubing and once finished it will be complete with the Shimano aero decals and a complete NOS Shimano 600ax group.
I will post pics when done
Chuck Schlesinger
SadiLah handmade framesets
San Diego, CA USA