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William Johnson and Sons (Leeds) Ltd., of Castleton Foundry, Leeds
1899 Partnership change. '... us the undersigned, William Johnson and Walter Wroe Johnson, carrying on business as Engineers, at Castleton Foundry, Armley, in the city of Leeds, under the style or firm of William Johnson and Sons, has been dissolved as and from the tenth day of September, 1899. All debts due to and owing by the late firm will be received and paid by the said William Johnson who will continue to carry on the said business alone under the said style or firm of William Johnson and Sons...'
1917 Advert. Plant for Coal Briquettes, cement; Crushing and Grinding Machinery; Mining Plant etc. William Johnson and Sons
1919 Advert. Plant for Coal Briquettes, cement; Crushing and Grinding Machinery; Mining Plant etc. William Johnson and Sons
1947 William's grandson, Lieut-Col H H Johnson became an active director, the third generation of the family to join the firm
1949 See William Johnson and Sons: Catalogue
Other machinery produced by the firm included cement making, briquetting, metalliferous ore reduction, chemical machinery, etc.