求翻译：Established in 1878, the company started by offering agricultural inspection services to grain traders in Europe. From those early beginnings, we grew in size and scope as our agricultural inspection services spread around the world. On 19 July 1919, the company adopted the name of Société Générale de Surveillance (today, known as SGS). During the mid-20th century, we began to diversify and started offering inspection, testing and verification services across a variety of sectors, including industrial, minerals and oil, gas and chemicals, among others. In 1981, the company went public.是什么意思？

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