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| Company name | Primary business area | Primary coverage | |
|---|---|---|---|
| Dahua Technology Ltd | Digital video recording | Global | ![]() |
| DVTEL, Inc | CCTV | Global | ![]() |
| Dali Technology Co. Ltd. | CCTV | China | |
| Dallmeier electronic GmbH & Co.KG | CCTV | Global | |
| Dedicated Micros | CCTV | Global | |
| Detector Technologies Ltd | Explosives and chemical detection | United Kingdom (UK) | |
| Diversified Events Hong Kong Ltd. | Exhibition and conference organising | Hong Kong | |
| DSC | Intruder alarm | Global | |
| DSX Access Systems, Inc. | Access control | Global | |
| D E S Security Systems | Integrated security | United Kingdom (UK) | |
| D&A Systems Ltd. | Consulting services | United Kingdom (UK) | |
| D-Link | Digital video recording | Global | |
| D-Link Systems Inc. | Digital video recording | United States of America (USA) | |
| D-max (DongYang Unitech Co. Ltd.) | CCTV | Korea (South) | |
| D-max (Dongyang Unitech Co.) | CCTV | Australia & NZ | |
| D-MAX (DongYang Unitech Co., Ltd) | CCTV | Korea (South) | |
| D-Serve | Manned guarding | India | |
| D-Tech Communications | Intruder alarm | Canada | |
| D-TEG Security Co., Ltd | Mobile DVR for Transportation | Korea (South) | |
| D.N.W. Security Systems | CCTV | United Kingdom (UK) | |
| D.O.G-sec | Perimeter protection | Global | |
| D.S.V. Srl | CCTV | Western Europe | |
| D3 Security Management Systems | Software | Canada | |
| D3Data | HostedVideo.com | Software | United States of America (USA) | |
| Dabas Facility Services Pvt. Ltd. (D-Serve) | Physical security | India | |
| DAccess Tehnologies | Access control | India | |
| DAD Ltd. | Security entrances | United Kingdom (UK) | |
| Dadhwal plastics | CCTV | Asia | |
| Dailianxu Engineering Co. Ltd. | CCTV | Global | |
| DAILY RFID Co.,Ltd | RFID | China | |


