William Buist-Wells

Calder Holdings Ltd. supplies lead sheet, specialty fabricated lead products and other lead parts. The company was founded on January 12, 1998 and is headquartered in Chester, the United Kingdom.

Columbia-Staver Ltd. manufactures and markets heat sinks. The company's products include aluminum heat sinks, EMI/RFI screenings, clips, spacers and other accessories. It also designs fine blank multi-slide, multi-stage, transfer and lamination tools. The firm serves customers in the aerospace, automotive engineering, and electronics and technology manufacturing industries. The company was founded in 1972 and is headquartered in Wickford, the United Kingdom.

Part of Caldergroup Swiss AG, Calder International Holdings Ltd. functions as an investment holding British company. The company is based in Chester, UK and was founded in 1998.

Stamptree Ltd. operates as a holding company with interest in engineering services. The company was established on 25 November, 2010 and is headquartered in Chester, GB.