- octave mechanism neck guard
- octave mechanism two body octave vents
- Octave Mechanism & Key
- octave mechanism 1
- octave mechanism 2
- octave mechanism rear view
- octave mechanism using wear-free felt pivoted ball joints
- octave mechanism with 2 body octave vents
- octave mechanism with 2 body octave vents
- Octave Mechanism with Double Octave Vents
- octave mechanism with neck attached
- Octave Mechansim
- Octave Vent
- Octave Vent