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Crighton, Teal & Diggle of Manchester
1863 Slater's Directory of Manchester and Salford, 1863 does not include Crighton, Teal & Diggle. This suggests that the firm did not exists in 1863, although this is by no means conclusive. William Diggle is not listed, but a Duncan Crighton and a George Teal are individually listed, as mechanics. Their addresses are 140 and 142 (respectively) Ridgway Street, Butler Street, Ancoats.
1867 Partnership between Duncan Crighton, George Teal and William Diggle (Millwrights, Engineers & Machinists, under the style or firm of Crighton, Teal & Diggle) dissolved by mutual consent, 27th October 1867 
By 1870 had become part of Union Engineering Co