Analysis of information sources in references of the Wikipedia article "Fret" in English language version.
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Fragment of a wooden lute. This is only the neck of the instrument, the body has not survived...There are marks showing at the top of the fingerboard where two strands of gut, probably with a third strand on top of them to raise the height of the strings, served as a nut. The surviving doubled strand of gut was a fret, and the slightly thicker single strand may have been a fret for higher notes...Registration number 1907,1111.90
[Information about the magazine article this ran in is at www.xueshu.com/hl/201410/3683520.html]
[Information about the magazine article this ran in is at www.xueshu.com/hl/201410/3683520.html]