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De Winton & Co of Union Works, Caernarfon (Caernarvon, Carnarvon) were manufacturers of marine and stationary engines, boilers, waterwheels, mining machinery and locomotives. At their peak they employed 300 persons.
1840s the company was founded by Owen Thomas.
1869 Horizontal single cylinder engine for telpher at Dorothea Quarry, Nantlle. Photographed by George Watkins in 1954.
1894 Maker of the 'Simplex' Emergency Grip for Cranes and Winches. 
1902 The firm closed.