Martin Graf
Martin Graf
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Martin Graf is an expert and advisor for design and implementation of siren systems for mass and early warning at HÖRMANN Warnsysteme, a leading siren manufacturer from Germany.

Why mass warning and notification systems still need sirens

Mass or early warning systems are becoming increasingly important due to the rising number of natural disasters. The core of a mass or early warning system is the siren – despite modern technologies, sirens are the only component that reliably…

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