Improvements in aeronautical machines of the annular aerofoil type
GB439298A
Improvements in helicopter flying machines
GB399886A
Improvements in or relating to flying machines of the helicopter type
GB318732A
Improvements relating to aeronautical machines
GB280604A
Improvements in or relating to aeronautical machines
GB237350A
Improvements in or relating to aeronautical machines and engines therefor
GB209895A
Improvements in or relating to aeronautical machines
GB196131A
Improvements in or relating to aeronautical machines and to means for the propulsion of same, parts of which improvements are also applicable to marine vessels
GB180467A
Improvements in aeronautical machines of the helicopter type
AU1181408B
Improvements in airships andin apparatus for propelling thesame
