JH Metrology
- Full service laboratory for calibration and repair of electronic and physical/dimensional test equipment.
- http://www.jhmetrology.com/

International Corrugated Case Association
- Corrugated cardboard trade organization with headquarters in Rolling Meadows. Information on corrugated cardboard, a survey, and a list of publications.
- http://www.iccanet.org/

Graftel, Inc.
- Engineering firm providing support, instrumentation and calibration services. Includes technical information, services and contacts.
- http://www.calibrationlabs.com/

L-3 Communications, Electrodynamics Inc.
- Manufacturers of data recorders, electronic safe and arm devices. System and component information, employment listings.
- http://www.l-3com.com/edi/

Charles Industries, Ltd.
- Manufacturers in a number of industrial fields. Information on corporate groups, trade show appearances, about the company, and employment opportunities.
- http://www.charlesindustries.com/

Tellurian Technologies
- Design and manufacture of crystals and crystal-based products, including custom requests.
- http://www.telluriantech.com/

Sumer Inc.
- Representing various electronic component manufacturers. Includes available products, information on what's new from their suppliers, and contact information.
- http://www.sumer.com/

MMC Electronics
- Supplier of electronic components. Lists available products and advanced materials.
- http://www.mmea.com/

Spartanics
- Manufactures automated equipment. Includes technical support, press releases, and their catalog.
- http://www.spartanics.com/