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Dean began investigating the epidemiology of fluorosis in 1931. By the late 1930s, he and his staff had made a critical discovery. Namely, fluoride levels of up to 1.0 ppm in drinking water did not cause enamel fluorosis in most people and only mild enamel fluorosis in a small percentage of people.
US cities began using hollowed logs in the late 1700s through the 1800s. Today, most plumbing supply pipe is made out of steel, copper, and plastic; most waste (also known as "soil") [30] out of steel, copper, plastic, and cast iron. [30] The straight sections of plumbing systems are called "pipes" or "tubes".
List of years; Timelines of world history; List of timelines; Chronology; See calendar and list of calendars for other groupings of years.; See history, history by period, and periodization for different organizations of historical events.
WHEN DID WATER FLUORIDATION AS A POLICY BEGIN? In the early 20th century, some U.S. researchers observed that people who lived in areas where community water supplies had naturally occurring high ...
Plumbing work is defined in the Australian Standards (AS3500) Regulations 2013 and refers to any operation, work or process in connection with installation, removal, demolition, replacement, alteration, maintenance or repair to the system of pipes and fixtures that conveys clean water into and liquid waste out of a building.
American Standard Companies Inc. was a manufacturer of heating, ventilation, and air conditioning (HVAC) systems, plumbing fixtures, and automotive parts.The company was formed in 1929 through the merger of the American Radiator Company and Standard Sanitary Manufacturing Company forming the American Radiator and Standard Sanitary Corporation.
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