DINGMAN: And I know you’re hooked up to an oxygen machine here — does that make it difficult?  JENSEN: No — well, yeah, mobility, and I have COPD, and I have trouble breathing. This business was part of the factor I have COPD, because I had a shop without ventilation. That’s why my lungs are not working. DINGMAN: Wait. So your lungs were damaged by doing the typewriter work? JENSEN: By the smell of the chemicals.  DINGMAN: He says his lung condition was diagnosed seven years ago.   JENSEN: They gave me a five-year life span. That was seven years ago, so I’m already beatin’ it.  DINGMAN: Ever the gambler, Duane’s still fixing typewriters. These days, he keeps a fan blowing, and works with the garage door open.