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of Chesterfield, engineers and boiler-makers.
1896 Business established by Frederick Clench
1897 Advertised for fitters, turners and erectors, non-union men, accustomed to high class and engine work, for new engine works. Clench & Co, Lincolm Works, Chesterfield.
1900 '... agreements were entered into with Messrs. Clench and Co., Ltd., a firm founded in Chesterfield by Mr. F. Clench in 1896, for the manufacture of steam engines of the high speed design. From 1900 to the end of 1905 the Company was continued as Bryan Donkin and Clench, Ltd., the Chesterfield works having the advantage of a central position in the Derbyshire coalfield, with blast furnaces for the supply of pig iron in the immediate neighbourhood and the service of two railways, each of which has siding into the works. At the beginning of 1906 the company was reformed under the title of "The Bryan Donkin Company, Ltd.," 
At the end of 1902, the whole of Donkin's works were moved to Chesterfield.
Bryan Donkin, Junior continued as chairman but stopped having an active participation in the management of the works.
From 1900 to 1905 the firm was known as Bryan Donkin and Clench Ltd.
Examples of Clench & Co's Engines
'FOR SALE. Engine, High Speed Vertical type, by Clench & Co., of Chesterfield. Size of cylinder, 7 1/2in.: stroke. 5in. Fitted with stop valve and Pickering governor, self-acting lubricators. The Engine will work up to 100lbs., and can be set to run from 300 to 400 revolutions per minute. It gives 10 B.H.P. at 50 lbs, steam, and 350 R.P.M. and 12 B.H.P. 70lbs. steam.— Apply J. Wildsmith. Foundary-street, Barnsley.'
Sheffield Corporation Tramways advertised lighting plant for sale at the Tramways Power Station, Kelham Island, which included a 25 kW. Silvertown DC dynamo driven by a vertical compound Clench engine, rated at 35 B.H.P., 300 R.P.M.
Clench & Co engine, 12" bore, 26" stroke, advertised for sale by Harrison Lee and Sons, Limerick.
A 100 HP horizontal engine by Clench was included in the sale of plant at the Government Wood Distillation Factory, Ludlow.
40 HP Clench engine advertised for sale at Bleadney Creameries, Wells, Somerset.