Alcoa
Alcoa
Tata Steel
Tata Steel
Arcelor Mittal
Arcelor Mittal
Lhoist
Lhoist
Imerys
Imerys
BHP Billiton
BHP Billiton
Conagra Foods
Conagra foods (Now Ardent Mills)
Procter and gamble
Procter and gamble
Mennel milling
Mennel milling
SGS
SGS
Standard Labs
Standard Labs
West Penn Testing
West Penn Testing
Tradet Laboratories
Tradet Laboratories
NRM Laboratories
NRM Laboratories
Alfred H Knight
Alfred H Knight
Dakota Gasification Company
Dakota Gasification Company
JEA
JEA
LG
LG
Saint Gobain
Saint Gobain
Lafarge
Lafarge
Honeywell
Honeywell
Petrobras
Petrobras
Iowa State University
Iowa State University
Carbo Ceramics
Carbo Ceramics
Huber
Huber
Owens Corning
Owens Corning