| http://www.w3.org/ns/prov#value | - Based in Abingdon, Oxfordshire in the UK, and with branch offices in Holland, the USA, Singapore and China, Crowcon's products are sold throughout the world, serving oil, gas and petrochemical companies, public utilities, clean water and sewage treatment companies, fire brigades, construction companies and other organisations where accidental leakage of gas or vapour can become a toxic or explosiv
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