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Heron's fountain is a hydraulic machine invented by the 1st century AD inventor, mathematician, and physicist Heron (or Hero) of Alexandria . [1] Heron studied the pressure of air and steam, described the first steam engine, and built toys that would spurt water, one of them known as Heron's fountain. Various versions of Heron's fountain are ...
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The Frazier Quarry, Incorp. The Frazier Quarry Inc. (TFQ) is a large family-owned quarry and stone product retailer in the United States. The company's headquarters are in Harrisonburg, Virginia, in the Shenandoah Valley. It stands as the sole producer of Shenandoah Valley Bluestone and offers a variety of crushed stone and retail products.
Millennium Park is a public park located in the Loop community area of Chicago, operated by the Chicago Department of Cultural Affairs.The park, opened in July 2004, is a prominent civic center near the city's Lake Michigan shoreline that covers a 24.5-acre (9.9 ha) section of northwestern Grant Park.
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The value of 615 ppm above the outdoor concentration indicates approximately 15 cubic feet per minute of outdoor air per adult occupant doing sedentary office work where outdoor air contains over 400 ppm [118] (global average as of 2023). In classrooms, the requirements in the ASHRAE standard 62.1, Ventilation for Acceptable Indoor Air Quality ...
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