NFPA 297: Guide on Principles and Practices for Communications Systems
NFPA 297 通信系统的原理与操作指南
Deals with systems, their components, and operations that involve the transfer of information over a distance utilizing electrical or electronic means.
NFPA 297: Recommended Practice for Fire Fighting Equipment Preventive Measures Fire Signals and Fire Fighting Personnel in Metal Mines. - Editions Prior to 1997
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