| ABB |
| ADALET |
| AEMC |
| ALL-TEST |
| ALTEK |
| AMERICAN
SOLENOID |
| AMPROBE |
| ANCHOR |
| ASSOCIATED
RESEARCH |
| AVO |
| B & K
PRECISION |
| BASLER |
| BECKMAN |
| BEEDE |
| BICCOTEST |
| BIDDLE |
| BYRAM
ELECTRICAL LABS |
| CANADIAN
SHUNT IND. |
| CHESSEL |
| CROMPTON
INSTRUMENTS |
| CUTLER
HAMMER |
| DIXSON |
| DORIC |
| DUNCAN |
| DURHAM |
| E-MON |
| ENM |
| ETI |
| ELECTRO INDUSTRIES |
| ELSTER |
| EMPRO |
| ESTERLINE ANGUS |
|
| EXTECH
INSTRUMENTS |
| F.W. BELL |
| FLUKE |
| FOSA
COMPUTERS |
| GENERAL
ELECTRIC |
| H.H.
STICHT |
| HIOKI |
| HITACHI |
| HOYT |
| IMS |
| ITT POMONA |
| JENSEN
TOOLS |
| JEWELL |
| KNOPP |
| KRAUS & NAIMER |
| LANDIS &
GYR |
| LAUREL
ELECTRONICS |
| LEADER |
| LEM |
| LFE / API |
| MEGALERT |
| MEGGER |
| METER
DEVICES |
| METER-TREATER |
| MILBANKS |
| MODUTEC |
| MULTI-AMP |
| NEWPORT |
| MONARCH |
| NON-LINEAR
SYSTEMS |
| PML |
| PHOENIX |
|
| POWERCET |
| POWERTEC |
| PROGRAMMA |
| PROTEK |
| RAYTEK |
| REDINGTON |
| RED LION |
| ROCHESTER
INSTRUMENTS |
| RUSTRAK |
| SCIENTIFIC
COLUMBUS |
| SIMPSON |
| A.W.
SPERRY |
| SELCO |
| SQUARE D |
| SHIMPO |
| SYMCON |
| TEKTRONIX |
| TELOG |
| TEXMATE |
| THOMAS &
BETTS |
| TIF |
| TIME MARK |
| TRIPLETT |
| UNITRONICS |
| WAVETEK
METERMAN |
| WESCHLER
INSTRUMENTS |
| WESCON |
|
WESTINGHOUSE |
| WESTON |
| WESTRONICS |
| WICC |
| YOKOGAWA |
|
