Tools

Stanley: Connecticut. Merged with Black&Decker
Black&Decker: in Maryland, merged with Stanley in 2010.
Porter-Cable, DeWalt: subsidiary of Stanley Black &Decker.
Skil: Bosch
Ridgid: a division of Emerson Electric
Dremel: US., sold to Bosch from 1993
Ryobi, Makita: Japan
Milwaukee: in WI, acquired by a HK company in 2005
Craftsman: Sears (Kmart, OSH)
Irwin: from Ohio, and NC.
Husky: used to be under Stanly, sold to Home Depot
Kobalt: Lowes own brand (lauched in 1998 to compete Hustky, Craftsman)
Bessey / Jorgensen (lowes / Home Depot)

-- [update:9/22/2011]
Snap-On: Based on Wisconsin, 2.4B revenue now.
SK: Illinois.
Proto: acquired by Stanley in 1984.
Matco: stands for Mac Allied Tool Company. Ohio.
Gearwrench: belongs to Danaher Corp.
Duralast: Autozone.
Armstrong: Chicago, acquired by Danaher Corp.

[update: 10/10/2011]
Channellock: pliers in PA
Klein: in Illinois, good for electronic tools, and lineman's pliers.
Knipex: Germany, pliers.