- Author
- Underwriters Laboratories, Incorporated
- Title
- Report of Research on Emergency Signaling Devices for Use by the Hearing Impaired.
- Coporate
- Underwriters Labs., Inc., Northbrook, IL
- Report
- US187; 89NK20252; Subject 1971, March 20, 1991, 93 p.
- Keywords
- signals | devices | handicapped | fire alarm systems | vibration | fans | safety standards
- Identifiers
- flashing lights; air movement; vibrators