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David Crosthwait (1898-1976) was an African American mechanical and electrical engineer who pioneered innovations in heating, ventilation, and air conditioning systems during the early to mid-20th century. He earned a mechanical engineering degree from Purdue University in 1913 and went on to hold 3...
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The Klein Tools ET450 is an analog inspection camera designed for detailed visual examination in tight spaces. It features a durable, rugged construction with a 9-inch flexible cable and integrated flashlight. This tool is particularly useful for electrical, HVAC, industrial, and mechanical professi...
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Alice H. Parker was an American inventor whose 1919 patent described a gas-fired central heating system with separately controlled room ducts.
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