X-ray tube with tungsten anti-cathode, aluminium cathode and asbestos vacuum regulator, American,1915
1910-1920
1910-1920
1896-1905
1897-1898
1896
1897-1907
1874-1900
1896
1896-1905
1906-1915
1914-1925
1915-1925
1915-1925
1910-1928
1895-1900
1885-1910
1897
1900