| Notes |
Associated Iliffe Press, Black and Decker Ltd. (Craftsman lathe), Bold & Burrows, S.N.Bridges & Co. (electric hand-drill), Braid Bros., Buck & Ryan Ltd. (Burnerd "Grip-tru" chuck, universal tool-holder), Chloride Batteries Ltd., R.J.Deaves, Munster Chemical Co., H.D.Murray, Myford Engineering Co., ("Super 7", ML8 lathes), John M.Perkins & Smith Ltd. (Mason Master), Philplug Products, The Rawlplug Co. Ltd., H.Rollet & Co., Ross & Alexander (London) Ltd., Spiral Saws Ltd., Sprayt, "Engineer Apprentice", T.S.Harrison & Sons Ltd., Heller & Sons (Engineers) Ltd., W.Kennedy Ltd. (bending appliance), Kennion Bros. (Hertford) Ltd., William Levene Ltd., Ernest T.Mant, Percival Marshall & Co., Meccano Ltd., "The Model Engineer", The Web Model Fitting Co., Werner Laurie Ltd., Wilmac Products, Wilmot Mansour & Co., Winchester Engineering Co., Wolf Electric Tools Ltd. (sensitive drill and fretsaw), G. & R.Wrenn |