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Antique Doorknob Collectors of America
Protecting, preserving, and studying the wide range of ornamental builders hardware that is a part of America's heritage.
http://www.antiquedoorknobs.org/
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Crystal Windows and Door
Manufacturer of aluminum and vinyl windows and residential entrance doors.
http://www.crystalwindows.com/
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Door and Hardware Institute
Serves as the resource for information on doors, hardware, security and specialty products for the architectural openings industry.
http://www.dhi.org/
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Door Express
Manufactures, distributes, and installs residential wood and metal doors including fir, hemlock, oak, pine, and maple with moulded and hollow core styles available.
http://www.doorex.com/
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Essex Openings
Group of manufacturing companies that produce doors, frames, and hardware.
http://www.essexopenings.com/
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Horner Millwork
Manufacturer and distributor of doors, windows, kitchens and stairs to the residential, commercial and architectural markets.
http://www.hornermillwork.com/
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International Door Association
Has dealer members world-wide who furnish and install garage door opening systems and industry members which manufacture and distribute them.
http://www.doors.org/
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