You can display and print diagrams as early as mid-1970s on...

You can display and print diagrams as early as mid-1970s on Tektronix 4014/4015 graphic terminals. I was developing world leading systems in mining applications in 1980 and 1981. No mouse cursor and you have to program the 2 thumb wheel cross hair cursors to act as a "mouse cursor". World leading because my boss went around the world for 5 weeks visiting top mining companies and when he came back, he said no one had developed as advanced systems as mine. In late 1991, I was corresponding with www server and browser developers in trialing out their systems on different computer operating systems. Co-founded hotcopper with 10 others in 1994 and each spi point was $25 then. TBL, the inventor of www came to lunch in December 1998.