Conversation tube hearing aid, Europe, 1850-1920
1850-1920
Single truss
1890-1930
Single truss
1890-1940
Double truss
1890-1940
Double truss
1890-1940
Double truss
1890-1930
Single truss
1890-1940
Double truss
1890-1940
Double truss circular
Single truss
1890-1940
Single truss
1890-1940
Single truss
1850-1910
Single truss
1880-1913
Double truss
1890-1940
Double truss
1890-1930
Spinal support
1850-1920
Spinal support
1850-1920
Double truss for the treatment of a hernia, London, England, 1901-1918
1901-1918
Double truss
1890-1940
Single truss
1890-1940
Double truss
1890-1930
Double truss
1890-1940
Double truss
1890-1930
Double truss
1890-1930
Double truss
1890-1930
Double truss
1890-1940
Electrode, for arm or leg
1890-1930
Double truss
1890-1930
Double truss
1890-1940
Truss, for umbilical hernia
1870-1920