For example, for the Gases under pressure hazard class, the hazard categories are Compressed gas, Liquefied gas, Refrigerated liquefied gas and Dissolved gas. These classes relate to the physical state of the gas when packaged and do not describe the degree of hazard.
1 In 1596, a flush toilet was invented and built for Queen Elizabeth I by her Godson, Sir John Harrington. 2  The first patent for the flushing toilet was issued to Alexander Cummings in 1775. 3  During the 1800s, people realized that poor sanitary conditions caused diseases.
The first reference to paper as toilet paper was recorded in 1718. After invention of paper pages from newspapers and magazines were also commonly used (newspapers became widely available at 1700s.) Joseph C. Gayetty invented the first packaged toilet paper in the United States in 1857. Joseph C. Gayetty is credited as the inventor of modern commercially available toilet paper. Gayettyâs Medicated Paper was sold in packages of flat sheets, medicated with aloe and watermarked with his name.