A colliery viewer or coal viewer was the manager of a coal mine or colliery. The term was mostly used in the late eighteenth to nineteenth centuries, in the UK. In modern use, the viewer would be the senior and responsible mining engineer at a site.[1][2][3]
DMM, Occupations
was invoked but never defined (see the help page).Mackenzie, 1825
was invoked but never defined (see the help page).Greenwell, 1849
was invoked but never defined (see the help page).