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References
1.
British Patent No. 3372, 1810.
2.
British Patent No. 1809, 1876. British Patent No. 29 286, 1896. British Patent No. 28 899, 1897.
3.
British Patent No. 1663, 1859. British Patent No. 67, 1869. British Patent No. 618, 1869.
4.
British Patent No. 765 753, 1955.