FWIW, I just viewed the Colnago video interview. Mind you it's an English dubbed version but he definitely refers to welding at Gloria. Also, the pre-1970 segments use the first person in statements, such as "I built a frame for..." while as of the 1970's he uses the collective "we". To me, the "I" references seem to indicate when he was actually building frames, while "we" refers to the company and a period when he was no longer building frames personally.