What is the relationship between Walkman and Sony 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.

Indeed, in the year after the digital Walkman disaster, Stringer, the British man running the Sony American operations, threw himself into the task of fighting the silos, with sometimes comical results.

Answer: manufacturer