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In the early 20th century, growth of the business and the extension of activities into new fields caused the need for increased space for machine and structural shops. In 1901, Heyl & Patterson acquired land for a manufacturing plant on Pennsylvania Avenue along the Ohio River in Allegheny City, now known as Pittsburgh's North Side. All machine ...
Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
Stack array of the Jones and Laughlin Pittsburgh Works on the south side of the Monongahela River, 1955.. The Jones and Laughlin Steel Corporation, also known as J&L Steel or simply as J&L, was an American steel and iron manufacturer that operated from 1852 until 1968.
Get 50% off this bestselling drill set from Dewalt during Presidents Day. The set comes with a drill, driver, battery charger, carrying case, and two batteries. This 5-star DeWalt drill is lower ...
There are nine Fortune 500 companies headquartered in the Pittsburgh metropolitan area. [1] 120 PNC Financial Services (financial) 220 PPG Industries (industrial) 226 Howmet Aerospace (industrial) 245 Wesco International (industrial) 254 Viatris (pharmaceuticals) 310 U.S. Steel (industrial) 330 Alcoa (metals/mining) 362 Dick's Sporting Goods ...
An earlier patent covering both square-socket- and triangle-socket-drive wood screws, U.S. patent 161,390, was issued to Allan Cummings of New York City on March 30, 1875. As with other drive types conceived and patented in the 1860s through 1890s, it was not manufactured widely during its patent lifespan because of the difficulty and expense ...