Pemko
Door seals, thresholds, continuous geared hinges.
http://www.pemko.com/

Randy Surley Manufacturing Company
Manufacturer and supplier of premium weather stripping and thresholds for Dallas, Texas area.
http://www.randysurleymfg.com/

Specialty Doors
Interior doors, glass doors, sliding glass doors, acoustical doors, traffic doors, frameless glass doors, frosted glass doors, exterior folding doors, and door hardware.
http://www.specialtydoors.com/

Wayne-Dalton
Wayne Dalton is manufacturer of America's Safest Garage Door Systems for residential and commercial garage doors and garage door openers.
http://www.wayne-dalton.com/

Heart of England Limited
Manufacturer and supplier of hardware items for the Architectural Hardware Trade and DIY markets, including card frames, door closers, mirror screws and numerals Cardholder
http://heartofenglandltd.co.uk

Town & Country Garage Door
Town & Country garage door of Dallas services sales and repairs all residential garage doors and LiftMaster genie opener openers
http://garagedoorpartsales.com/

Glory Hardware Industry Co Ltd
Manufacture and exportation of hinges, door lever handles, door bolts, door holders and other builder's hardware.
http://www.gloryhardware.com/

The Lockbox Door Protector
Title Insurance, Mortgage Lending, Home Inspection and Real Estate Marketing Tool. Your company name at the front door.
http://www.lockboxdoorprotector.com

Creative Hardware
Custom residential and commercial door and cabinet hardware. Creative Hardware's exclusive design's are hand-crafted by a sculpture artist. Our unique designs create an unforgettable impression. Custom pieces are also available by working with the Creative Hardware design team.
http://creativehardware.com/

Thresholds: Copan Ruins
THRESHODLS: A journey through Mexico and Central America; Many stories, photographs and insights of indigenous culture through a traveler's eye
http://www.thresholds.net/copan/index.html