| AECo | Automatic Electric Company, Chicago, USA. |
| AEI | Associated Electrical Industries (successor to Siemens Brothers). |
| AEP | Automatica Electrica Portuguesa (Portuguese subsidiary of ATM Ltd) |
| ATE | Automatic Telephone & Electric (ATM was renamed ATE in 1936). |
| ATM | Automatic Telephone Manufacturing Company. |
| Autelco | Automatic Electric Company, Chicago, USA. |
| AWA | Amalgamated Wireless Australasia. |
| BHOTCo | British Home & Office Telephone Company. |
| BTM, BTMC | Bell Telephone Manufacturing Company, Belgium. |
| BWE | hobbyist expression for British Western Electric (see WECo) |
| Centrel | Portuguese manufacture that acquired the assets of the Plessey factory in Portugal for £1 in 1979. It made 700-type telephones under licence. |
| CS | Communication Systems Ltd (ATE subsidiary) |
| DeTeWe | Deutsche Telephon Werke, Germany. |
| Etelco, ETL | Ericsson Telephones Ltd. |
| GEC | General Electric Company Ltd. |
| H&BIWC | Helsby & British Insulated Wire Company. |
| K&S | Kapsch & S”hne, Austria. |
| LME | L.M. Ericsson, Sweden. |
| MT | Merk Telefonbau (or similar), Germany (T&N was the parent firm). |
| PTEW | Phoenix Telephone & Electrical Works. |
| RATCo | Relay Automatic Telephone Company. |
| RTC | Reliance Telephone Company. |
| SB & Co. | Siemens Brothers & Company. |
| S & H, S-H | Siemens & Halske, Germany (no connection with SB & Co after 1914). |
| SER | Svenska Elektron R”r (an LM Ericsson subsidiary) |
| STC | Standard Telephones & Cables (also said to indicate s*d the customer). |
| TEL | What many people mistakenly assume the ETL symbol means. |
| T&N | Telefonbau & Normalzeit GmbH, Germany (Telephone Construction & Standard Time Company). |
| TMC | Telephone Manufacturing Company. |
| WECo | Western Electric Company (UK subsidiary became STC in late 1920s). |
| BACK | Home page | BT/GPO Telephones | A - Z Index | Glossary of Telecom Terminology | Quick Find | All Telephone Systems |
FM