GB 260804, Eyston, George Edward Thomas, "Improvements in and connected with the method of constructing impellers for rotary pump machines", published 1926-11-11
GB 348524, Eyston, George Edward Thomas, "Improvements in or relating to rotary pumps and blowers", published 1931-05-05
GB 375886, Eyston, George Edward Thomas, "Improvements in and connected with rotary pump and like machines", published 1932-07-07