GB 189804990, Giblin, Albert, "Improvements in Flushing Cisterns", published 1 March 1898, issued 9 April 1898
GB 189700724, Crapper, George & Robert Marr Wharam, "Improvements in or relating to Automatic Syphon Flushing Tanks", published 11 January 1897, issued 6 March 1897