Correct me if i'm wrong; Walker-Turner became Rockwell and Rockwell became Delta.
or something along those lines...
Sort of. You're got it more or less backwards, but it hasn't been exactly easy to keep track of some of the players, and it's actually gotten even harder to do in the past 8 years.
Here's most of the timeline for the products now known as Delta and Porter-Cable. The current use of the Rockwell name for some Asian imports sold on late-night infomercials has nothing to do with the original Rockwell Manufacturing Co. other than taking advantage of an old and once-respected name.
1906: Porter-Cable founded.
1919: Delta Manufacturing Co. founded as Delta Specialty Co.
1919: Rockwell Manufacturing Co. founded as Wisconsin Axle Co.
1928: Wisconsin Axle Co. merges with Timken-Detroit Axle Co.
1931: Walker-Turner founded.
1939: Timken-Detroit buys Delta Manufacturing Co.
1941: Timken-Detroit buys Crescent Machine Co. (heavy woodworking machinery).
1945: Crescent and Delta became part of Rockwell Manufacturing Co.
1948: Rockwell Manufacturing Co. buys Red Star Products (radial arm saws).
1949: Kearney & Trecker Corp. buys Walker-Turner.
1956: Rockwell Manufacturing Co. buys Walker-Turner from Kearney & Trecker Corp.
1960: Rockwell Manufacturing Co. buys Porter-Cable.
c1964: Walker-Turner brand discontinued by Rockwell. Rockwell stops using the Porter-Cable name about the same time, but continues making Porter-Cable products under the Rockwell brand. Some Walker-Turner products continue under the Delta-Rockwell brand.
1967: North American Rockwell formed by the merger of Rockwell Standard (originally formed from Timken Detroit Axle Co.) and North American Aviation.
1969: North American Rockwell helps put man on the moon.
1973: North American Rockwell and Rockwell Manufacturing Co., and all their subsidiaries (Delta, Collins Radio, and so on) merge to form Rockwell International. Rockwell International stops using the Delta brand name at the same time.
1981: Rockwell International sells the portable power tool division that was formerly the Porter-Cable brand to Pentair, Inc., who renames it Porter-Cable Corp.
1984: Rockwell International sells the stationary machine tool division that was formerly Delta and Delta-Rockwell to Pentair, Inc., who renames it Delta International Machinery Corp.
2004: Pentair, Inc. sells its Porter-Cable and Delta International Machinery brands to Black & Decker.
2010: The Stanley Works and Black & Decker Corp. merge to form Stanley Black & Decker.
2011: Stanley Black & Decker sells the Delta International Machinery brand to Chang Type Industrial Co. Ltd., who moves it to South Carolina and renames it Delta Power Equipment Co.
So, over the past 93 years, Delta has been, in order:
Delta Specialty Co.
Delta Manufacturing Co.
Delta Power Tool Division of Rockwell Manufacturing Co.
Rockwell International
Delta International
Delta Power Equipment Co.
And over the past 106 years, Porter-Cable has been, in order:
Porter-Cable
Rockwell
Rockwell International
Porter-Cable
And Walker-Turner was, in order:
Walker-Turner
Walker-Turner Divison of Kearney & Trecker Corp.
Walker-Turner Division of Rockwell Manufacturing Co.
Done and gone, c1964.
And Rockwell was, in order:
Wisconsin Axle Company
Timken-Detroit Axle Company
Rockwell Manufacturing Co.
Rockwell International Corp.
Out of the power and machine tool business in 1984, and not in it now except by name association.
Quite possibly more than anyone really cares to know about the company histories, but there you have it.