Melroe was Bobcat before a Chicago advertising firm they hired told them to re-brand under a new more "catchy" name, hence the birth of Bobcat. Unless you need parts for the Wisconsin engines ( which are scarce as hens teeth and just as pricy) most of the other parts can be found or made without too much issue. That's the beauty of start ups - they mostly build off the shelf - after they get bigger their parts become "proprietary". You have to look but there are manuals available online, and parts can be found either original or aftermarket.
BTW, my local Bobcat dealer has a restored 600 series on their show room floor, I'm not sure but it might be a three wheeler