Small business self-certification, a one-year certification which requires annual renewal, is a prerequisite for verification as a Small Diverse Business. Visit smallbusiness.pa.gov for program guidelines, Frequently Asked Questions (FAQs), and step-by-step instructions for the self-certification process.
The main uses for coal are Fuels, Plastics and Electricity.
Coal was first used as a fuel around 1000 BCE in China. With the development of the steam engine in the United Kingdom in 1769, coal came into more common use as a power source. Coal was later used to drive ships and locomotives. By the 19th century, gas extracted from coal was beiyg used for street lighting in London.