Green, Samuel | 1793–1797 |
Hull, William | 1801–1815 [1830?] |
Lawless, Timothy | 1822–1838 |
Telford & Sons | 1870–? |
Telford & Telford | 1847–1870 |
Telford, Edward Henry | 1870–1932 |
Telford, Henry | 1847–1866 |
Telford, William | 1830–1885 |
Telford, William Hodgson | 1870–1890 |