Amazon.com: Viking 30 Watt Paging Amplifier with Loud Ringing and 6 Powered Speaker : Electronics
EF Johnson Viking VP900 Firefighting Speaker Mic
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Amazon.com: VIKING Paging System with Amplifier with 2 Speaker Horns Fully Powered for Use Through Phones for Schools, Warehouses, Offices, Autoshops, etc. : Office Products