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  2. Heyl & Patterson Inc. - Wikipedia

    en.wikipedia.org/wiki/Heyl_&_Patterson_Inc.

    Heyl & Patterson participated in a high-profile project for the Public Auditorium Authority of Pittsburgh - the Civic Arena. Applying technology normally used for ore bridges and other bulk material handling machines, Heyl & Patterson designed and manufactured the trucks, gear motors and 480-volt AC motor drive that opened and closed the arena ...

  3. Jones and Laughlin Steel Company - Wikipedia

    en.wikipedia.org/wiki/Jones_and_Laughlin_Steel...

    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.

  4. Pratt-Read - Wikipedia

    en.wikipedia.org/wiki/Pratt-Read

    [6] In 2009, Pratt-Read filed for Chapter 11 bankruptcy protection. [7] On March 22, 2010, Ideal Industries announced the acquisition of Pratt-Read from bankruptcy. [8] Ideal acquired the Pratt-Read name and equipment and continued production out of existing Ideal facilities, as the Pratt-Read facility in Shelton, Connecticut had already ended ...

  5. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    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.

  6. List of corporations in Pittsburgh - Wikipedia

    en.wikipedia.org/wiki/List_of_corporations_in...

    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 ...

  7. Ampco Pittsburgh - Wikipedia

    en.wikipedia.org/wiki/Ampco_Pittsburgh

    Ampco-Pittsburgh Corporation (American Metal Products Company) is a specialty steel manufacturer headquartered in Downtown Pittsburgh, Pennsylvania. [3] It is one of several companies to bear the Ampco name, and it should not be confused with the Milwaukee-based copper base alloy producer, Ampco Metal Inc.; the Miami-based cabinetry company; the Swiss aluminum corporation; or the Dallas-based ...