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of Sherlock Street, Birmingham
Probably successor to Alexander Dean
1855 Adertisement: 'MALT CRUSHERS, According to Act of Parliament. WILLIAM TONKS has great pleasure in informing the Public at large that he has purchased from Mr. WILLIAM DEAN, Engineer, &c, Nos. 1 and 42, Oozells-street, Broad-street, Birmingham, a MALT CRUSHER, which has greatly exceeded his utmost expectation. It will crush a strike of Malt in under 3½ minutes, with the greatest ease.
Parties about purchasing Malt Crushers may see his at work at the Cemetery Tavern, Key-hill, Hockley, Birmingham, or the various sizes may be seen at Mr. Dean's Manufactory, as above.
W. T. has taken the opinion of many parties who have seen his at work, and they all agree that it is decidedly the best and cheapest out.' 
1859 William Dean, of Sherlock Street, contracted to erect a steam engine, boiler, and pump, for £293 14s. for baths at Woodcock Street, Birmingham.
1861 Listed as an engineer and machinist, at 267 Sherlock Street, Birmingham
1862 Advertisement: 'STEAM ENGINES for SALE. -High-pressure, direct acting, from 2 to 10-horse, with or without boilers. One second-hand Table ditto, equal to new, with Boiler and Fittings complete, 10-horse power. One 6-horse Centre Beam ditto, equal to new. 5, 7, and 8-horse Portable ditto, equal to new; also a Baulk Mill for a 30-in. deal, which was made to order, and 36 saws if required. -For particulars, apply to William Dean, Smithfield Works, Sherlock Street, Birmingham.'
1863 William Dean of Sherlock Street, Birmingham, bankrupt 
1863 Death notice: 'On the 29th ult., at his residence, Victoria Road, Mr. William Dean, engineer, late of Sherlock Street in this town; deeply regretted.'