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Mintrop field seismograph, recording apparatus and box, for geophysical prospecting
1921
1921
1971-1980
1930-1935
1930-1935
1960
1930-1935
1930-1935
1885
1912
1914
1907
1914
1933-1936
1880
1902
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1898
1928
1937-1938
circa 1925
1886
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1909
1908
1930-1935