- Author
- National Safety News
- Title
- Electronic Security Systems.
- Journal
- National Safety News, Vol. 106, No. 1, 63-68, July 1972
- Keywords
- industrial plants | fire detection systems | photoelectric detectors | television | radio equipment
- Identifiers
- audio detection; motion detection; vibration detector; photo-electric; electro-mechanical; electronic fence; radio-frequency; closed-circuit television; door, gate control