Ah yes, construction equipment. Frequently with a master switch, then the "normal" key operation. There was a large recall to add a shield over the solenoid on the starters. Due to the configuration, the contacts were open to starting the machine with a screwdriver. A local guy used the screwdriver to start the shovel-dozer one morning, the bucket lever was in curl, the machine started and when the arms came together, it popped his head like a mellon. There were many recalls to add a cover to this part of the starters.