Glass negative of electrocardiograph trace, 1915-1925
1935-1945
1935-1945
1888
1839
circa 1880-1885
1933 (1888)
1930s (1888)
6 January 1935
1937
circa 1886
1873
circa 1860
1938-06-26
1939-07-28
1938-06-26
1940-08-11
1935-04-09
1934-12-10
1938-06-26
1937-10-12
1934-12-10
1937-12-15
1938-06-26
1932
1940-08-11
1938-01-19
1938-05-24
1934-12-10
1938-06-26
1943-03-01
1940-08-11
1938-06-26
1932-09-01
1932-09-01
1938-01-19
1932-01-20
1930s
1932-03-18
1938-06-26
1937-10-12
1932-09-01
1937-12-15
1940-08-11