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.
Clawfoot Bathtub Refinishing and History Â» The first flushing toilet was invented by Sir John Harrington. Oldest Plumbing Commode. In 1596, the first flushing toilet was invented by Sir John Harrington. He made one for himself and one for his godmother Queen Elizabeth. These were the only two ever produced. After Sir John published a book describing his invention, he was mocked into retirement for his foolish creation.