- STERLCO
- SUNTEC
- TACO
- TEKMAR
- TJERNLUND
- TRERICE GAUGES
- TRIANGLE TUBE PHASE III
- TRIDELTA IND.
- TURBO MAX
- TUTHILL
- UNILINE
- UNILUX BOILERS
- UNITED BRASS
- UNITED INSTRUMENT
- UNIVERSAL ENTERPRISES
- UTILITY (WONDER)
- VESUVIUS
- VISE GRIP
- VIKING
- WARREN ELECTRIC
- WARRICK
- WATSON-MCDANIEL
- WATTS REGULATOR
- WAYNE COMBUSTION
- WEIL MCLAIN
- WEISS INSTRUMENTS
- WEKSLER INSTRUMENTS
- WESTWOOD PRODUCTS
- WHITE-RODGERS
- LOVEJOY
- LYNN
- MAG LITE
- MAGNATROL
- MAID-O-MIST
- MALCO
- MASTERCRAFT
- MAXITROL
- MCDONNELL & MILLER
- MERCOID
- MIDCO
- MID-CONTINENT
- MILL-ROSE
- MONARCH
- PETROMETER
- POWER FLAME
- PREFERRED UTILITIES
- PROVEN PUMPS
- PUROLATOR
- RECTORSEAL
- R.I.B.
- RIDGID TOOLS
- RIELLO
- ROBERT SHAW
- SARCO/SPIRAX
- SCHNEIDER BUILDING AUTOMATION
- SELECTA-SWITCH
- SIEMENS
- SIMER
- SLANT/FIN
- S.O.S. PRODUCTS
- SOLBERG
- SPENCE
- SPENCER GAS BOOSTERS
- STA-RITE