Typewriter repair was our family business too. My dad opened a repair shop in our garage in about 1980, and at its peak he had a handful of employees, repairing mostly IBM Selectrics for offices and schools in the Seattle metro area. I would wander out there when I was off school and watch him working, or any of the employees who didn't mind me hanging around. The timing was not great, and the family business didn't make it even all the way to his retirement, let alone to the next generation, but I can still smell that repair shop.