What is the relationship between Kenworth and PACCAR in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

PACCAR is simultaneously developing hydrogen fuel cell powered vehicles and has built 10 Kenworth T680s for customers in the Port of Los Angeles.

Answer: parent_organization