What are some of the most efficient and well-working engines your company has created

Question: What are some of the most efficient and well-working engines your company has created
- Keywords:
  company,
  engine,
  machine,
  work
Asked by anon-239550 to Struan, David on 17 Mar 2020.
- David Threlfall answered on 17 Mar 2020:
  
  The Trent jet engines have been made for 25years, some of the early designs are still in service.

Question: What are some of the most efficient and well-working engines your company has created