Harrison and Sons Limited
1750: founded by James Harrison; 1839-1849: Harrison and Co; 1849-1854: Harrison and Son; 1854-1920: Harrison and Sons; 1860 - Business located at 59 Pall Mall, London; 1920-1997: Harrison and Sons Ltd; printed stamps 1881-1997; 1997: the De La Rue (DLR) group purchased Harrisons and changed name to De La Rue Security Print