| KERTSOPOULOS CONSTRUCTION CLASSICAL MODELS |
| YORGOS KERTSOPOULOS GUITARS INCLUDE ''THE MATHEMATIC MODEL'' WHICH WAS INVENTED BY HIM ACCORDING TO TRADITIONAL STANDARDS IN THE HISTORY OF CLASSICAL GUITAR CONSTRUCTION. |
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| MATHEMATIC MODEL INCLUDED |
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| CRYSTALLIC BRONZE LININGS |
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| ACOUSTIC HEEL DESIGN |
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| ENGRAVED CRYSTALIC BRONZE |
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| CRYSTALLIC BRONZE DECORATION |
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| EXTENDED BRIDGE DESIGN |
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| INTONATED WOOD DECORATION |
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| TRADITIONAL HEAD DESIGN |
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