Jeffery and Blackstone
1881 Mention of a 4.5 hp vertical steam engine by Jeffrey and Blackstone 
1882 Fire at the J&B premises destroys the patterns 
1882 J&B exhibit a grass-mower at the Bath and West show at Cardiff 
1882 J&B Exhibit a hay-maker at the Royal Agricultural Show at Reading 
1882 Jeffery sold his interest in the business.
1887 Moved to new works.
1887 Exhibited the 'Viator' engine at the Newcastle Show.
1889 Jeffery and Blackstone became a limited company and changed their name to Blackstone and Co
Sources of Information
- The Sheffield & Rotherham Independent, Thursday, July 07, 1881
- The Dundee Courier & Argus, Monday, January 30, 1882
- The Bristol Mercury and Daily Post, Thursday, June 1, 1882
- Nottinghamshire Guardian, Friday, July 14, 1882