- 1Statement of payments received by Robert Bill relating to premiums owned by manufactures on Trevithick's high-pressure steam patent (MS/1944/02)
1804, item - 2Letter from Robert Bill to Messrs Haynes and Douglas (MS/1944/03)
1804, item - 3Letter from Robert Bill to Mr Haynes (MS/1944/09)
20th May 1808, item - 4Letter from Robert Bill to Messrs Haynes and Douglas (MS/1944/11)
3rd July 1808, item - 5Letter from Robert Bill to Messrs Haynes and Douglas (MS/1944/12)
21st July 1808, item
