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- Benham Companies
- Oklahoma City
Services include architecture and mechanical, civil, environmental, and petroleum engineering.
www.benham.com
- Civil Engineering
- Topographic Engineering Company
- Oklahoma City
Land surveying, mapping, GIS, and GPS products and services.
www.topographic.com
- Zahl-Ford
- Oklahoma City
Full-service structural engineering firm, providing design, investigative, contractor, and other services.
www.zahlford.com
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