- 1Reference: SP7/3/3
Title: Assignment of patent from John Mangnall concerning ‘A process for generating carbonic acid gas and a...
Level of description: item
Date Free Text: 18 Feb 1888
Production date: From: 1888 To: 1888 - 2Reference: SP7/6/20
Title: John Mangnall and Robert Samuel Lloyd reference improvements in generating carbonic acid gas
Level of description: item
Date Free Text: 1888
Production date: From: 1888 To: 1888