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| OTHER SUPPLIERS |
| | Sigmet, Inc. | | Leader in Weather Radar Signal and Data Processing Systems and Application Software | | |
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| | Signature Communications | | Specialists in Communication and Locating Solutions | | |
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| | Signet AC Limited | | Specialists in Public Address Systems and Emergency Voice Communication Systems | | |
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| | Sigtronics Corporation | | Specializes in Emergency Apparatus and Aviation Communications | | |
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| | Silent Knight | | Specializes in Fire Protection Solutions | | |
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| | Simulcast Solutions ®,LLC | | Specializes In All Aspects of a Specific Land Mobile Radio Application | | |
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| | SIND SRL | | Specialists in Surveillance and Security Systems | | |
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| | Sioux Merchant Patrol | | Providers of Security Services | | |
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| | Sippican Inc. | | Specializes in the Design and Manufacture of Electronic and Mechanical Systems and Subsystems and Associated Services | | |
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| | Sirti Limited | | Specialists in Control Room Equipment/Furniture, Communication Equipment & Systems, and Telecommunication Networks & Systems | | |
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| | Skytel Corp. | | Specializes In Wireless Data and Messaging Services, Wireless Email, Interactive Two-Way Messaging, and Wireless Telemetry Services | | |
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| | Smartsight Networks | | Providers of Electronic Security Products | | |
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| | Smartvue Corporation | | Specializes in Leading Edge Visual Intelligence Solutions | | |
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| | Smd-Funksteuerungs GmbH | | Specialists in Alarm Management, Building Security, Security Management, and Video Surveillance | | |
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| | Smiths Detection | | Leaders in Transportation Security, Based On a Combination of Trace Detection and X-Ray Security Technologies | | |
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| | Smiths Detection-Livewave Inc. | | Leading Providers of Enterprise Digital Video Surveillance Solutions for Mission Critical Applications | | |
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| | SNES-Syndicat National des Entreprises de Sécurité | | Manufacturers of Communication and Locating Solutions | | |
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| | Sonico Systems GmbH | | Suppliers of Control Room Equipment/Furniture, Communication Equipment & Systems, and Telecommunication Networks & Systems | | |
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| | South Midlands Communications Ltd. | | Specialists of Communication and Locating Solutions | | |
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| | Special Electronics & Designs Inc. | | Specializes in Designing and Manufacturing Communications Equipment for Hazardous Working Environments | | |
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