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'''Patents''' are also useful for their descriptions of some musical instrument circuits and the approaches the designers took which may not be described to the same extent by other publications, although the variety of patent laws between countries can lead to contradictory information.<ref>[http://www.till.com/articles/arp/patents.html ARP patent reviews] collated by J. Donald Tillman, September 2007</ref><ref>[https://web.archive.org/web/20210826030218/http://synth-diy.org/pipermail/synth-diy/2000-May/104955.html Patents and Copyrights], Synth-diy mailing list, 23 May 2000</ref>
== How patents work ==
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