Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 137,430 pages of information and 221,356 images on early companies, their products and the people who designed and built them.
John Davis and Son of All Saints Works, Derby and London
1820 Business established
1889 Gravet slide-rule.
1891 Released a catalogue of their miners' safety lamps. 
1896 Electric low water alarm
Represented Jeffrey Manufacturing Co of USA, coal mining machines
1900 Incorporated as a limited company
1901 Theodolite 
1911 Doubled the capacity of their foundry for casting brass, gun-metal and aluminium 
1911 A new Theodolite (John Davies (sic) and Son) 
1911 London Address - 17 Victoria Street, Westminster.
1913 Advert for Korden counter
1917 Advert for Slide Rules
1919 Advert for Slide Rules
1924 Brought out a new slide rule known as the "Monocrat".
1927 Advert for Slide Rules