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Termistore HP modello 477B, 1955-1960 (478A, INV. CNR N. 181640 del 6.10.1970).
Agilent 477B Manual, www.atecorp.com/ATECorp/media/pdfs/data-sheets/Agilent-477B_Manual.pdf
PhyMuse: phymuse.univ-lille.fr/categorie/6-6-hyperfrequences
HP Memory Project: Microwave Measurement Accessories, www.hpmemoryproject.org/wa_pages/wall_a_page_06.htm
WikipediA: Microwave power meter, en.wikipedia.org/wiki/Microwave_power_meter
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