- A. D. Williams Engineering Inc.
- Multi-disciplined consulting engineering firm. - Boge and Boge, Ltd.
- Providing consulting engineering services in the mining, agriculture, civil, structural, foundation and environmental fields. - Burnside Group of Companies
- Engineers, hydrogeologists, and environmental consultants. - CERCL (Chemical Engineering Research Consultants Limited)
- Provides a broad range of consulting services. The members of CERCL are all professors in the Department of Chemical Engineering at the University of Toronto, with diverse areas of expertise. - Cook Engineering
- Consulting services for the pulp and paper and mining industries. - Ellis Engineeering Inc
 - Fransen Engineering Ltd.
- Serving the pulp and paper, petroleum, and chemical industries. - Goodfellow Consultants Inc
- Environmental engineering, occupational health and safety, and indoor air quality. - H.G.C. Engineering
- Consulting engineering firm specialising in noise, vibration, and acoustics. We also do noise impact studies, research and development, and noise isolation. - Hinz Consulting
 - ICI Tracerco
- Services include online troubleshooting and process investigation, distillation column and exchanger leak testing, distribution studies on reactors, and flowrate measurement. - Information Engineering Group
 - J.L. Richards & Associates Limited
- J.L. Richards & Associates Limited is an integrated A/E practice offering services in architecture, all major engineering disciplines and planning. - Keewatin-Aski Ltd.
- Provides engineering and architecture consulting services in Ontario. - Levelton Engineering
- Provides a diverse range of resources in areas which include materials and corrosion, building science, analytical chemistry. - McCormick Rankin Corporation
- Specialise in transportation services. - McElhanney Group Ltd.
- International engineering consultancy and land mapping services. - MCL Miley Company Limited
- Offers project development, preliminary and detail engineering, procurement services, and more for the processing industries. - Met-Chem Canada Inc.
- Consultants in mining and metallurgy. - Proot, Jacques - Consultant
- Metallurgy and chemistry. - Sandwell Inc
- Provides engineering services & systems integration in the forest products, transportation, telecommunications, energy, natural resources, food, beverage, manufacturing & institutional sectors. - Thompson Rosemount Group (TRG)
- Specialising in consulting, engineering, architectural design, design/build/operate, process control systems, and custom software development. - Trow Consulting Engineers Ltd
- Multi-disciplinary engineering firm offering services in the geosciences, environment, building science, mechanical, electrical, construction materials, pipelines, and fire and life safety. - Vaughan Engineering Associates
- Our work is concentrated in the fields of engineering, geomatics, computer graphics and environmental and management consulting.
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