A & A CONCRETE PRODUCTS
ABBOTT FURNACE CO.
ACRES INTERNATIONAL
ACCEL SIGN GROUP
ACTION MANUFACUTING
AIR & NOISE PRODUCTS
AIR LIQUIDE
AIR PRODUCTS & CHEMICALS
AK STEEL
AKW STEEL
ALCOA
ALCOSAN
ALMATIS
ALLEGHENY LUDLUM
ALLEGHENY METALWORKING
ALLEGHENY MINERALS
AKZO CHEMICAL
ALPHA-FRYE TECHNOLOGIES
ALLENWOOD FED. PRISON
ALPHA SINTERED METALS
ANCHOR HOCKING
AMERICAN EAGLE PAPER
AMERICAN GEOSCIENCES
ARMSTRONG CEMENT
ARTHUR BUILDING SYSTEMS
APPLETON PAPERS
ARISTECH CHEMICAL
ATLAS PRESSED METALS
BABST CALLEND
BARNSTEEL ABRASIVES
BEAR METALLURGICAL
BEAVER CO. TRANSIT AUTH.
BEAVER VALLEY ASPHALT
BELLEFIELD BOILER
BETHLEHEM STEEL CORP.
BLACKHAWK A. P.
BLAKE & AUGUST ENV.
BUCHANON INGERSOL
BUCKNELL UNIVERSITY
BUFFALO PAPERBOARD CORP.
BUTLER AUTO AUCTION
BUTLER COLOR PRESS
BUTLER CO. COMM. COL.
CALEX CORPORATION
CAMBELL DURRANT BEATTY
CAMP DRESSER MCKEE
CAMTECH INC.
CARBONE OF AMERICA
CASTLEBAY, INC.
CASTLE ENVIRONMENTAL
CCL CONTAINER
C. D. TOWER & ASSOCIATES
CEMEX
CENTURY ALUMINUM
C/G ELECTRODES
CHICO DAIRY
CLARION BATHWARE

CLARION SINTERED METALS
CLEARFIELD MACHINE CO.
COAL SPRING STONE SUPPLY
CONCAST METAL PROD.
CONSOLIDATED COAL CO.
CONTACT TECHNOLOGIES
COOKSON ELECTRONICS
CORE COMPLIANCE GROUP
COURIER CORP.
CREATIVE PULTRUSIONS
CURTISS WRIGHT 
CYRUS RICE
DALLAS – SCI
DINSMORE SHOLE, LLP
DOW JONES
DRUG PLASTICS & GLASS
DTC ENVIRONMENTAL
DUKE ENERGY
DUQUESNE LIGHT COMPANY
DUNBAR ASPHALT
DUSTEX
DYNO NOBEL
ELLWOOD CITY FORGE
ELLWOOD NATIONAL FORGE
ELLWOOD QUALITY STEEL
ENERCON SERVICES, INC.
EPHRATA COMMUNITY HOSP.
EQUITABLE RESOURCES
ERIE BRONZE & ALUMINUM
ERVIN AMASTEEL
ETHAN ALLEN FURNITURE
FARMERS MUTUAL INS., CO.
F.B. LEUPOLD
FILMET
FORBES METRO HOSPITAL
FEDERAL AVIATION ADMIN.
FOLLENSBEE STEEL CORP.
FISHER SCIENTIFIC
GENERAL ELECTRIC
GENCO
GE THERMOMETRICS
GILBERTS INS. & CONS.
GKN SINTERED METALS
GLEN GARY BRICK
GLENN O. HAWBAKER 
GREENVILLE METALS
GREER INDUSTRIES
HAMOT MEDICAL CENTER
HARLEYSVILLE INS., CO.
HASKELL OF PITTSBURGH 
HEDSTROM
HERCULES PAINTING CO.
HEYL & PATTERSON
HILLCREST GROUP
HOOVER VACUUM
HYGIENE SAFETY & TRAINING
I-A CONSTRUCTION

IDL / CLOVERLEAF
INDSPEC CHEMICAL
INDUSTRIAL MACHINE WORKS
INMETCO
INTERSTATE CHEMICAL
J & L STRUCTURAL STEEL
JEMCOR
JENDOCO CONSTRUCTION
JIM BEAM BRANDS CO.
J.M. HUBER CORP.
JOHNSTOWN WIRE
KENNAMETAL
KEYSTONE CARBON
KEYSTONE FOUNDRY
KEYSTONE POWDERED METAL
KLETT LIEBER R & S
KOPPEL STEEL CORP.
LABARGE
LATROBE BREWING/LABATTS
LEYBOLD VACUUM PROD.
LIBERTY PULTRUSIONS
LINTON INDUSTRIES
MAC STEEL
MADILEY CAPITAL
MAGNETICS
MANGANAS ENTERPRISES
MARCEGAGLIA
MARMON KEYSTONE
MASCOTECH
MATTHEWS INTERNATIONAL
McCARL'S INDUSTRIAL
McCUTCHEON ENTERPRISES
MEDRAD
MERCER LIME & STONE
METALTEC STEEL ABR.
MOTION CONTROL
MOUNTAIN RESEARCH, INC.
NALCO 
NAPCO BUILDING PRODUCTS
NATIONAL AMUSEMENTS
NATIONS ENERGY
NEVILLE PULVERIZED LIME
NEW CENTURY CAREERS
N. A. HOGANAS
OBERG INDUSTRIES
OHIO VALUE HOSPITAL
OMG AMERICAS
ONEX
OSRAM/SYLVANIA
OWENS ILLINOIS/BROCKWAY
PEDERSEN & PEDERSEN
PELTECH / PELOROX
PENN METAL STAMPING
PENRECO
PINEY CREEK POWER PLANT
PITTSBURGH BREWING CO.
PHOENIX SINTERED METALS

POWDER METAL PRODUCTS
PPG INDUSTRIES
PRECISE TECHNOLOGY
PREFORM SPECIALTIES
PROCEDAIR INDUSTRIES
PYRON METAL PRODUCTS
RAIL BEARING SERVICES
REDLAND BRICK
RESPIRONICS
RESOLITE
RHI REFRACTORIES
RJ LEE GROUP
RUSSELL STANDARD
RYNONE MFG. CORP.
R.T. PATTERSON
SAINT GOBAIN
S & D INDUSTRIAL PAINTING
SGL CARBON COMPANY
SHARON TUBE
SINTERFIRE
SKF, USA, INC.
SOMMERSET REFRIDG.
SPECIALTY PRINTING
ST. MARYS PRESSED METALS
STACKPOLE CORPORATION
STATE FARM INSURANCE CO.
SYMMCO, INC.
TELEDYNE
TEXTRON LYCOMING
THE TIMKEN COMPANY
THREE RIVERS ALUM. CO
THREE RIVERS POWER SWEEP
TORRANCE STATE HOSPITAL
TOTAL PRACTICE MGT.
TOUCHSTONE RESEARCH
TRAIL KING
TUCKER ARENSBERG, PC
T-THERMAL COMPANY
UNITED STATES STEEL
U.S. AIRWAYS
V&M STAR
WATSONTOWN BRICK
WAYNE CROUSE, INC.
W.B. WELLS CO.
WESTINGHOUSE
WESTVACO
WENDELL AUGUST FORGE
WHEELING PITT STEEL
WHEMCO
WHITE HAVEN CENTER
WEYERHAEUSER
WORLD CLASS PROCESSING
WESTINGHOUSE GOV’T SERV.
YORK ENGINEERED SYSTEMS
YOUCHAK & YOUCHAK
YOUNG GALVANIZING
ZINC CORP. OF AMERICA