Simplex L.T. sparking plug, patented 1904
1904
1904
circa 1920
1934
1909-1915
1914-1919
circa 1900
1934
1916-1919
1907
1902
1914-1919
1914-1919
1934
circa 1906
1963
1914-1919
1900
1934
1934
1913
1906-1908
1897-1900
1934
1919
1930
1961
1900-1913
1934
1930-1935
1933