
Brennan's Gyroscopic Mono-rail Car
1907
1907
1917
1909-1910
circa 1915
1830 (original); 1967 (model)
1952-3
1910
1910
1909
1915
1913
2000-100 BCE
1910
1908
1912
1914
1910
1934
1912
1955; 1830
1915
circa 1910
1915-1917
1916-1917
1914
1914
1906
1917
1907-1917
1907-1917
1907-1917
1915
1906-1915
1906
1915
1907
1914
1914
1872 (original); 1909 (model)
1915
c.1912
1910
1916
1911
1914
1906-1916
circa 1916
1914-1916
1915
1906