Microtonal Guitar - Tolgahan Çoğulu

Hi, my name is Tolgahan Çoğulu. I am a guitar professor at Istanbul Technical University Turkish Music State Conservatory. Here are my guitar designs:

ADJUSTABLE microtonal guitar in 2008
LEGO microtonal guitar in 2020 with my son Atlas Çoğulu and Ruşen Can Acet
AUTOMATIC microtonal guitar in 2021 with Selçuk Keser