At least car manufacturers consist of more than one production line. They make smaller series and prototypes too. And they have lines (and suppliers) that suppl

At least car manufacturers consist of more than one production line. They make smaller series and prototypes too. And they have lines (and suppliers) that supply parts to other lines. Remember they also have to build the ECUs, dashboard and AC plumbing. If you squint that might be about what you need for a ventilator.