Lee's perforating cannula, steel and ebony, probably British, second half 19th century Lee's perforating cannula 1851-1900
Two tracheotomy cannulae, silver-plated, by Medical Supply of London, 1880-1920 Two tracheotomy cannulae 1880-1920
Tracheotomy cannula, ill-matched sections, silver, one section by Montague of London, 1896-1920 Tracheotomy cannula 1896-1920
Five 'Wallace Flexihub Internal Jugular Cannulas', made by H G Wallace Limited, with adaptions by Alan Gliston, United Kingdom, 1973 Five Wallace Flexihub internal jugular cannulas 1973