| QED ( Chappaqua, NY ) | QEDSoft, Inc. ( San Francisco, CA ) | Qest Quantenelektronische Systeme( Boblingen ) |
| QED Environmental Systems, Inc. ( Ann Arbor, MI ) | QEI Corporation ( Williamstown, NJ ) | Qest Quantenelektronische Systeme GmbH ( Reutlingen, DE ) |
| QED Technologies International, Inc. ( Aurora, IL ) | QEM S.r.l.( Montebello Vicentino ) | Qest Quantenelektronische Systeme Tubingen GmbH ( Boblingen, DE ) |
| QED Technologies, Inc ( Rochester, NY ) | QEM, Inc. ( Largo, FL ) | QF MEDTECH AB ( Stockholm, SE ) |
| QED Technologies, Inc. | Qenico AB ( Akersberga, SE ) | QFIX Systems, LLC ( Avondale, PA ) |
| QED Technologies, Inc. ( Rochester, NY ) | Qenm.com ( Half Moon Bay, CA ) | Qfoam Pty. Ltd.( Geebung ) |
| QED, Inc. ( Greenbelt, MD ) | Qesco International | QFX Technologies, Incorporated ( Memphis, TN ) |
| QEDSoft, Inc. | Qest ( Dallas, TX ) | |
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