This firm was started in about 1920 at Ryco Works, Bower Springs, by pocket-knife cutlers Arthur George Ryalls (1887-1958) and Charles Frederick Cooke (1889-1962).  Ryalls was the son of a coal dealer; Cooke was the son of William (a spring-knife finisher) and his wife, Elizabeth.   In 1921, the firm advertised in The Ironmonger a full range of cutlery, but was dissolved two years later.  C. F. Cooke & Son, cutlery manufacturer, Holly Lane, appeared in the Sheffield directory in 1925.  By 1930, Charles F. Cooke was listed at Cambridge Street.  In the Register of England & Wales (1939), he was enumerated as a ‘manufacturing cutler’.  His office was in Cambridge Street; his residence was at Main Avenue, Totley Rise.  Meanwhile, in 1939 Ryalls was working as a pocket knife cutler, making Army knives.  Arthur G. Ryalls, of Lambert Street (where he had been raised), died on 18 May 1958, leaving £1,566 to his wife, Letitia.  His former partner had retired at the end of the War and died in 1962.