Open letter advertising patent "Excelsior" Full Bore Parallel Slide Sluice Valve, and the benefits of such an item.
Letter, typewritten. Letterhead in blue and black ink involves a large drawing of the St. Mungo Works, and down the side various products are advertised, most of which appear to be related to plumbing, piping, and valves. The letter must date from the early 20th century, although it is not dated (beyond "19..", which is part of the letterhead).
Created: 2 September 2011, Last modified: 20 October 2011