Berlitz Schoool of Language; fl 1930; Language school founded by E Champmartin, 116 Friargate, Derby.
C B Keene; fl 1930; Photographic and scientific instrument dealers, 18 Market Place, Derby.
Charles Jordan; fl 1930; Costumiers and furriers, St James' St, Derby.
Clulow's; fl 1930; Bookshop, 18 Irongate, Derby.
Cox & Malin Ltd; fl 1930; Wine and spirit merchants based in Rodney Yard, Cornmarket, Derby.
Derby Gas Light and Coke Company; 1820-1990; Became part of the East Midlands Generating Board in 1949; the Central Electricity Generating Board was privatised in 1990.
Derby Laundry Co Ltd; fl 1930; Based in Alvaston, Derby.
Excelsior Rubbing Stone Co Ltd; fl 1930; Stone quarrying firm of 86 Siddals Road, Derby.
Feilden; Henry (d 1910); Captain; Of Kirk Langley, Coxbench and Derby; purveyor of Crimson Cross Ointment, a patent medicine. The Crimson Cross Dispensary was based in Strutt's Park, Derby.
G & A Pegg; fl 1930; Shipping and tourist agents, Green Lane, Derby.
G W Hall Ltd; fl 1930; Manufacturers of travelling cases and trunks, London Road & Cornmarket, Derby.
Hamblin & Sons Ltd; fl 1930; Cateres, confectioners, provision, wine and spirit merchants, Derby. Proprietors of the King's Cafe Restaurant, Ste Peter's St, Derby.
Hartington Nursing Home; fl 1930; Private nursing home at 47 Hartington St, Derby.
Innes & Sons; fl 1930; Auctioneers, estate agents and valuers, 23 Wardwick, Derby.
J E Chattell; fl 1930; Confectionery manufacturers, Crown Works, Abbey Street, Derby.
J P Higham; fl 1930; Boot and shoe business at 7 Sadler Gate, Derby, formerly Ward & Son. Part of their equipment consisted of X-ray machines for the feet.
Jerram & Compnay Ltd; [1834]-fl 1930; plumbers, electricians and heating engineers
John Smith and Sons; 1841-; Clockmakers of Derby
Kemp's Commercial College; fl 1930; Derby college; principal Walter Kemp.
W Brentnall & Son; fl 1930; Painters and decorators, 47 Curzon St, Derby.
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