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| Number | A | B |
|---|---|---|
| 3M | A & G | Bagh |
| ABB (Asea Brown Boveri) | Bahco Vaerktoj | |
| ABB Ceag | Baldor | |
| ABB Control Inc. | Balluff | |
| ABB Controls | Bals (Reyrolle) | |
| Abbey Calbe Ltd | Bals Iud.Accessory | |
| ABB Industietechnik AG | Bals Industries Accessory | |
| ABB Motors | Band-It | |
| Abeco | Barrett | |
| Abtech | Bartec (UK) | |
| Abubrey | Barton Conduits | |
| Abus | Batt Electric | |
| Ackerman Electrical | Bauser | |
| Ackerman Johnson | Baumuller Nurnberg | |
| Acme Electric | B+B | |
| Acorn | BBC | |
| Adalet | Bedford Opto Technology | |
| Adaptaflex | Belden | |
| ADE | B.E.L.L. | |
| Adrance | Belling Lee | |
| AEG | Bender | |
| Agua Signal | Bendix | |
| A.Heyd | Benjamin | |
| Ahlstrom,A,OY | Berg | |
| Ahlstrom, Sweden | Berker | |
| Aiano | Bernstein | |
| AI Security | Best Power | |
| Airflow | Bettermann | |
| Aksel Slaarup & A/S | BI | |
| Alcoa | BICC | |
| Alitac Products | B.I.C.C. Components | |
| Alflex | BICC Ltd | |
| Allen-Bradley | BICC Vantrunk | |
| Allied power-shrut | Biersdorf | |
| Allied Tube & Conduit | Bill Swichgear | |
| Alpha | Bimed | |
| Alumax | Binder | |
| American Electric | Bitzer | |
| American Fluorescent | BIW | |
| American stamping | BKW | |
| Amfco | Blaco | |
| AMP | Blackburn | |
| Amphenol | B-Line | |
| Amprobe | Block | |
| ams | Block transformers | |
| Anaconda | Bluejay | |
| Anchor | BNC | |
| Anglepoise | Bock | |
| Anixter (UK) | Bon Accord | |
| A.O.Smith | Bopla | |
| Appleby | Bosch | |
| Appleton | Bowers | |
| Applied Security | Bowthorpe | |
| Aqua Signal | Bowthorpe EMP | |
| ARC | Brady | |
| Arcotronics | Bridgeport | |
| Area Lighting | Bright Star | |
| Argus | Brioicent | |
| Arrow | British Electric & Mfg | |
| Arrow Hart | Britmac Grosvenor | |
| Artesyn Technologies | Britool | |
| Asco | Broan | |
| Ashley-Rock | Brodersen | |
| ASM | Brondberg & Tandrup A/S | |
| Assmann | Brush Fusegear-Hawker Siddeley | |
| Atlass Copco | Brush Fuses | |
Automatische Mess-und Steuerungstechnik |
Bryant | |
| AVO | Buchanan | |
| AWG | Bulgin | |
| Axel Akerman | Buraplug | |
| Burgess | ||
| Burkert | ||
| Burndy | ||
| Busch | ||
| Busch-Jaeger | ||
| Bussmann | ||
| BWF |