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Sales began in 1956, and in 1973 the two chemists received a patent for the formula. [1] [2] C 8 fluorinated urethane constituent [3] that has later been replaced by a C 4 alternative. 3M reformulated Scotchgard and since June 2003 has replaced perfluorooctanesulfonic acid (PFOS) with perfluorobutanesulfonic acid (PFBS). [4]
The respiratory protective devices (RPD) can protect workers only if their protective properties are adequate to the conditions in the workplace.Therefore, specialists have developed criteria for the selection of proper, adequate respirators, including the Assigned Protection Factors (APF) - the decrease of the concentration of harmful substances in the inhaled air, which (is expected) to be ...
Coca-Cola inventor John Pemberton is known to have shared his original formula with at least four people before his death in 1888. [1] In 1891, Asa Candler purchased the rights to the formula from Pemberton's estate, founded the Coca-Cola Company, and instituted the shroud of secrecy that has since enveloped the formula. He also made changes to ...
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The Sixties Scoop, also known as The Scoop, [1] was a period in which a series of policies were enacted in Canada that enabled child welfare authorities to take, or "scoop up," Indigenous children from their families and communities for placement in foster homes, from which they would be adopted by white families. [2]
The term Baby Scoop Era parallels the term Sixties Scoop, which was coined by Patrick Johnston, author of Native Children and the Child Welfare System. [24] "Sixties Scoop" refers to the Canadian practice, beginning in the 1950s and continuing until the late 1980s, of apprehending unusually high numbers of Native children over the age of 5 ...
A hood scoop (North American English) or bonnet scoop (Commonwealth English), sometimes called bonnet airdam and air dam, is an upraised component on the hood of a motor vehicle that either allows air to directly enter the engine compartment or appears to do so. It has only one opening and is closed on all other sides.
They knock away smaller obstacles lying directly on the running surface of the railhead. Historically, fenced-off railway systems in Europe relied exclusively on those devices and cowcatchers were not required, but in modern systems cowcatchers have generally superseded them.
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