<https://esam.biz/categoria-prodotto/1-electric-measures-and-energy-management-en/1-3-network-analyzers-cl-0-2-of-the-reading-with-harmonic-analysis/?lang=en>
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"1.3 Network analyzers cl. 0.2 of the reading with harmonic analysis"
<https://esam.biz/prodotto/e1100/?lang=en>