Holt and Best combined to form Caterpillar. Kind of an interesting story on how it happened.
The story goes that they were constantly in court over patent infringements and the like and the judge had had enough. He asked one of the men if he would sell out to the other and got a 'no' for a reply. He turned to the other and asked the same question and and also got a 'no'. So the judge said well 'then I order you two to combine your businesses and form a partnership' and as Paul Harvey would 'the rest is history'.