_:n78763d812396417f9e0baa7ca92f3508xb2
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/Organization>
<https://shop.sylviamassy.com/product/graybar-equal-loudness-contours-guide-free-download-1955-essential-studio-information-audio-chart-table/>