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Du-Bois Reymond's electric semaphore

1890-1910

Contra angle handpiece

1935-1945

Contra angle handpiece

1930-1945

Student microscope by E. Hartnack

1831-1870

Speed increasing slip joint

1930-1940

Contra angle handpiece

1930-1945

2 Contra angle handpieces for No. 2 slipjoint

1930-1945
Tin containing Ohropax-antiphones, hearing protection ear plugs, made by Max Negwar, Potsdam, Germany, 1910-1920, as used by personnel during the First World War.

Tin containing Ohropax-antiphones

1910-1920
Adjustable double contra angle handpiece, nickel plated brass, by Kaltenbach and Voigt, Potsdam, Germany, 1930-1940

Adjustable double contra angle handpiece

1930-1940