1886- Company founded by Alphonse Constant Reyrolle in London to produce scientific instruments

1901-Business moved to Hebburn

1968- Merge with CA Parsons and Company to form Reyrolle Parsons

1977- Merged with Clarke Chapman to form Northern Engineering Industries plc

1989- Acquired by Rolls Royce plc

1998- Sold to VA Technologie AG

2005- Purchased by Siemens, operates as Siemens Reyrolle Switchgear, still based in Hebburn, Tyne & Wear