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Elements of an invention - visual aids for guitar
U.S. Patent # 4,559,861 -
A Teaching Device for Stringed Musical Instruments
comprised of two product designs containing basic information
1.Elements of music theory and guitar fingerboard grid
see also Constructed Respose Quiz at contibutor's profile http://www.curriki.org/xwiki/xwiki/view/XWiki/kyt
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cannot find lesson/ resource
The included links do not lead to the described reference material.