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model sykes lock and block signalling system
1875
1875
circa 1871
2000-100 BCE
1865
1867-1868
1875
1870
1866-1870
1870-1875
1872
circa 1868
1872 (original); 1909 (model)
1955; 1830
1875
1871
1870s
1865
1875
1867
1867
1872
1867
1865-1866
1866
1934
1893-4
1865
1801-1840 (original); 1901 (model)
1775-1799 (original); 1900-1907 (model)
1871
1839 (original); circa 1988 (replica)
1872
1870
1874
1870
1869
1930 (replica); 1834 (original)
1874
1873
1872
1871
1865
1867
1866
1830 (original); 1967 (model)
4000-2001 BCE
1990-96
1866-1870
1705-1737
1872