I no longer think he was a traveling salesmen.
My folks remember traveling salesmen. Even into the early 80s, let alone the mid-70s, he more than likely would have been required to dress nice - usually in a suit. I have been going through the paperwork again, along with some other documents, and came to the new conclusion that he had to have been a carpet dyeing worker, someone who either goes to peoples houses to dye it or they are dyed mass-produced in a factory.
Why do I think this? Well, Sal Rosenthal partnered with two men, consistantly; David Kelley, and Michael Vidal. Vidal mainly did his business in FLORIDA. Isn't John Doe's bus ticket from Florida? Vidal had a lot more patents than either Sal or David. While Sal and David patented techniques, Vidal patented machines. This is where I cannot tell if he worked in a mill or going to peoples homes to dye their carpet. There was a business in Florida who used one of Vidals machines, and while they are a family business, I never did find a mention of a Dwight or Pam.
I bet money John Doe died in his work uniform! It was all blue. The three men were very interested in bow dyeing, which was a technique to dye the color purple and violet. It makes so much sense that, if he did work with these dyes, they would probably use blue or purple to blend in accidents.
Also, Arrow Dyeing and Finishing was sued in 1979 over what seems to be over a payment claim. I cannot find much on this case but Arrow was sued by Clarklift Co over missing money. What is John Doe died transporting something from Clarklift, and that is why the lawsuit had to happen? (I think Doe has been there since '79 but I am no expert by any means, I am just a woman with a computer)
Also, David seems to have had a business literally blocks from 1411 May Street which was inspected by a branch of government but again, little to no details. I will post everything I found, such as patents of Vidal, Kelley and Rosenthal, including the family owned business who advertised some of Vidals products for their at-home dyeing business.
I am writing a better report of my findings tonight. Sorry that this seems sporadic!