Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,113 pages of information and 233,645 images on early companies, their products and the people who designed and built them.
J. Humphreys and Sons of Blackriding Electrical Works, Werneth, Oldham.
1891 Company established.
1920 September. Exhibited at the Machine Tool and Engineering Exhibition at Olympia with magnetic chucks. 
1945 Advert for magnetic chucks. (J. H. Humphreys and Sons) 
Acquired by Edgar Allen and Co.