input: Caterpillar_Inc. | keyPerson | Douglas_R._Oberhelman
target: The key person of Caterpillar Inc. is Douglas R. Oberhelman.
references: The key person of Caterpillar Inc. is Douglas R. Oberhelman. Douglas R. Oberhelman is a key person at Caterpillar Inc. Douglas R Oberhelman is a key person at Caterpillar Inc.