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1927 – Castlecary laboratory was started.
1927 – Alan Stein takes over the company after the death of his father John Gilchrist Stein.
1928 – Dr Hyslop was the first chemist in charge of the laboratory.
Below – 23/02/1929 – Falkirk Herald – John G Stein annual social outing.

21/09/1929 – Falkirk Herald – Marquis of Zetland’s visit – On Monday afternoon the Marquis of Zetland paid a visit to Castlecary Fire Clay Works of Messrs John G Stein Ltd. On his arrival, he was met by Col. Stein and was conducted over the works. The Marquis showed great interest in the various departments of brickmaking.
Below – 04/04/1931 – Falkirk Herald – Employee’s reunion – Annual gathering of employee’s of Messrs John G Stein & Co – Col Stein and the trade outlook.

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17/01/1936 – Kirkintilloch Gazette – Castlecary – Trade is exceedingly busy at Messrs Steins Fireclay Works at present. Extra accommodation is being provided.
22/05/1939 – Edinburgh Evening News – John G Stein & Co Ltd, Castlecary Fireclay Works are to give every employee who has 1 years service or over a weeks holiday with pay in the summer. Those with less than a years service will receive one day’s pay for every 2 months service.
07/09/1946 – Falkirk Herald – Wanted men and boys for firebrick works. Good wages. Inexpensive meals available at the works canteen. Apply John G. Stein & Co., Ltd., Castlecary Works, Bonnybridge.
14/06/1947 – Falkirk Herald – Men wanted for fire clay pit. Mining experience not essential, 6 weeks training given on trade union wages; after training energetic men can earn good wages on piece work – John G Stein & Co Ltd, Castlecary Works, Bonnybridge.
06/12/1947 – Falkirk Herald – Struck by a buckle. A further brickworks fatality was inquired into. On 17th October, David Jamieson (58), charge-hand, 60 Allandale, Bonnybridge lost his life at Castlecary Brickworks belonging to Messrs J. & G. Stein & Co., Ltd. The evidence was to the effect that Jamieson was found lying seriously injured underneath the driving wheel of a crushing machine, and was found to be dead when taken to the ambulance room of the works. A repair had been done to the motor of the machine which had been started up again. No one saw what had happened. Jamieson was last seen outside the wooden guard of the machine. Jamieson was found inside the guard, lying underneath the machine. He was in a crouching position. The buckle of the moving belt had struck him on the head. A formal verdict was returned.
28/02/1948 – Falkirk Herald – Wanted for Castlecary Works, men to train as Silica Brick Moulders, starting at 2s 03/4d per hour; also labourers for engineering and other departments at 2s per hour minimum (men over 21 years) plus good timekeeping bonus; Women and girls as odd stuff dressers and machine hands; 44-hour. 5-day week; union rates of wages: good canteen; bus fares paid over 3s per week.—Apply John G. Stein & Co., Ltd., Castlecary Works, Bonnybridge.
13/03/1948 – Falkirk Herald – Men wanted for fire clay pit. Mining experience not essential, 6 weeks training given on trade union wages; after training energetic men can earn good wages on piece work – John G Stein & Co Ltd, Castlecary Works, Bonnybridge.
Below – 1950 – 1967 – Castlecary Fireclay Works.

03/11/1951 – Falkirk Herald – Electrician wanted; must be skilled in maintenance and repair of all types of motors. Maintenance men and machinists wanted. Must be members of the A.E.U. Apprentices also required to train in these trades. Apply to John Stein & Co, Castlecary Works, Bonnybridge.
01/05/1954 – Falkirk Herald – Boy wanted for firebrick works office at High Bonnybridge. Good prospects for a smart boy. Applications to the Secretary, John Stein & Co, Castlecary Works, Bonnybridge.
09/10/1954 – Falkirk Herald – Maintenance Engineer required for large firebrick works. Applicants should have good general experience in heavy industry, including layout and erection of machinery. Able to control staff of approximately 40. Apply by letter in the first instance, giving details of education, experience, and present responsibilities, to Works Manager, John G. Stein & Co. Ltd., Castlecary Works, Bonnybridge. Stirlingshire.
03/09/1955 – Falkirk Herald – Mr Thomas Fletcher, Annieslea. High Bonnybridge has been promoted from the sales department at Castlecary Brickwork. Allandale, owned by Messrs John G. Stein & Co., Ltd., to be works manager at their Milnquarter Work. High Bonnybridge.
01/1959 – New plant is built to manufacture cements and patches.
07/1960 – The production of the Myrtle, Bluebell and Daisy silica bricks ceases.
1965 – An early computer is installed at the works. This is believed to have been the first installed at a brickworks in Scotland.
1970 – GR-Stein Refractories Ltd was formed by the merger of John G. Stein and Co and General Refractories of Sheffield. GR-Stein became a subsidiary of Hepworth Ceramic Holdings Ltd.
12/1979 – Fire brick manufacture is closed down.
10/1981 – Cement and patch manufacture is closed down.