Blutzucker-Kolorimeter of Crecelius-Seifert with 6 cavettes
1900-1980
1900-1980
1930-1935
1920-1940
1955-1958
1932
1964
1935
1930-1940
1926
1935
1932-1936
1890-1900
1968
1968-1970
1927
1930
1936
circa 1935
circa 1975
circa 1975
circa 1975
circa 1954
circa 1950
circa 1935
1929-1939
1937
1962
1925
1935
1935
1934-1944
1935
1935
1935
1930
1932
1936
1957
1965-1975
1937
1935
circa 1930
1935
1960