Airolite Company
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Allegheny Power
|
Appalachian Power Corp.
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Armco Steel
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American Electric Power
|
American Municipal Power
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Ames
|
A.E.C. Stacks
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August Environmental
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Ashland Chemical Company
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Ashland Oil Company
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American Boiler & Chimney Co.
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B.F. Goodrich Corporation
|
Bechtel Power Corp.
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Belco Technology Corp.
|
Bachmann Industries
|
Cabot Corporation
|
Combustion Engineering
|
Commonwealth Dynamics, Inc.
|
Controlled Demolition, Inc
|
Chapman Corp.
|
Cyanamid
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Dick Corporation
|
Eichleay Corp.
|
E.I. DuPont Denemours
|
Elkem Metals Co.
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F.L. Smidth & Company
|
GE Plastics
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GE Environmental Systems, Inc.
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Glitsch Package Plants
|
Gibraltar Chimney
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Gilbert Commonwealth & Assoc.
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Globe Metallurgical
|
Helmick Corporation.
|
Industrial Environmental Systems
|
Indiana & Michigan Electric Co.
|
Industrial Contractors
|
International Chimney Corp.
|
International Steel Services, Inc.
|
Kvaerner Songer Corp.
|
Kentucky Power
|
Legge Associates, Inc.
|
L.B. Foster
|
Monongahela Power Co.
|
Northwest Pipe
|
Ohio Edison Company
|
Oakpark Chimney
|
P.P.G. Industries, Inc.
|
Pioneer Pipe
|
Pullman Power
|
Pittsburgh Processing Corp.
|
Quaker State Refining Corp.
|
Roberts & Schaeffer Co.
|
SES, LLC
|
The Frederick Parker Group .
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The Thompson-Starrett Co.
|
Trimble Engineers & Constructors
|
Union Carbide Corp.
|
United Constructors Co.
|
VSL Corporation
|
Whiting-Turner
|
Warren Environmental Corp.
|
Willis & Paul Group
|
Witco Corporation
|
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