Durham's tracheotomy cannula, silver plated metal and ivory, with pilot and two spare tubes, by Mayer and Meltzer of London, 1869 to 1900 Durham's tracheotomy cannula 1869-1900
2 tracheotomy cannulae, silver plated brass, probably English, 1860-1900 2 tracheotomy cannulae 1860-1900