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The job was noisy, dangerous and often led to respiratory diseases. [43]: 35 In the United States the practice of employing children ended in 1933. [77]: 476 In modern mills doffing machines have replaced humans. [78]: 596 Child: 18: 20: Dog whipper: A dog whipper was a church official who removed unruly dogs from church grounds during services.
The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]
Coleman Heating & Air Conditioning is a major manufacturing brand of HVAC equipment, and was formerly an independent HVAC manufacturing company. The company began as a division of the Coleman Company in 1958 and was acquired by Evcon in 1990, which in turn was acquired by Johnson Controls in 1996.
An HVAC technician is a tradesman who specializes in heating, ventilation, air conditioning, and refrigeration. HVAC technicians in the US can receive training through formal training institutions, where most earn associate degrees .
Pipes and cables in the Large Hadron Collider, an example of the unity between mechanical, electrical and plumbing. Mechanical, Electrical, and Plumbing (MEP) refers to the installation of services which provide a functional and comfortable space for the building occupants.
U.S. patent 2,509,099 was issued on May 23, 1950 – System for controlling operation of refrigeration units. U.S. patent D159,209 was issued on July 4, 1950 – Design for air conditioning unit. U.S. patent 2,523,273 was issued on September 26, 1950 – Engine actuated ventilating system.
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