Gerald Grohmann

Darron Tool & Engineering (Sheffield) Ltd. manufactures and provides drilling tools and engineering services. The company was founded on December 9, 1969 and is headquartered in Chesterfield, the United Kingdom.

Techman Engineering Ltd. Manufactures and supplies precision machined products. Its products include darron oil tools such as integral blade stabilizers, DR model 60 reamer, large hole range hole opener, hardfacting, sealed bearing roller reamers, single stage hole opener, stabilizer mendrels, and standard stabilizer sleeves. The company was founded on January 11, 1990 and is headquartered in Chesterfield, the United Kingdom.

Part of Schoeller-Bleckmann Oilfield Equipment AG, Schoeller-Bleckmann Darron (Aberdeen) Ltd. is a modern manufacturing, repair, and maintenance facility for down hole drilling tools. Founded in 2000 and based in Dyce, UK, the facility houses machining, welding, and inspection capabilities under one roof. The British company provides complete manufacturing, repair, and maintenance services for an extensive range of drilling products utilized in the oil and gas sectors, particularly directional drilling. Additionally, they supply non-magnetic drill string components and material used in directional drilling.

Founded in 1996, Schoeller-Bleckmann Oilfield Equipment (UK) Ltd. is a holding British company that operates mining of non-ferrous metal ores through its subsidiaries. Part of Schoeller-Bleckmann Oilfield Equipment AG, the private company is based in Derbyshire, UK.

Part of Schoeller-Bleckmann Oilfield Equipment AG, Schoeller-Bleckmann Darron Ltd. was founded in 1993 and is a modern manufacturing, repair, and maintenance facility for down hole drilling tools. The private company is based in Aberdeen, UK and provides complete manufacturing, repair, and maintenance services for an extensive range of drilling products utilized in the oil and gas sectors, particularly directional drilling. The British company also supplies non-magnetic drill string components and material used in directional drilling. SBD is committed to providing the highest level of service to their customers and operates a fully accredited quality management system compliant with API Spec Q1 and API-7-1 and ISO 9001:2015.

D-Tech (UK) Ltd. designs and develops oil drilling tools. It offers D-Tech rotary steerable tool which is based on the push the bit principle of steering. The company was founded by Richard John Hutton and is headquartered in Bristol, the United Kingdom.

Berndorf AG is a holding company, which has subsidiaries in metalworking, toolmaking, and mechanical engineering industries. It specializes in tool construction, belt systems, press plates, heat treatment, automotive, mechatronics, pool construction, process engineering, wires, industrial plug units, and web services. The company was founded by Alexander Schoeller and Alfred Krupp in 1843 and is headquartered in Berndorf, Austria.