- INSTRUMENT FOR DRAWING IN SPHERICAL PERSPECTIVE
Spherical perspective, Palermo, 1986
- THE CONIC COMPASS
The conic compass: an instrument for drawing any kind of conic section through continuous movement, Roma, 1990
- OPTICAL SYSTEM FOR ORTHOGONAL PHOTOGRAPHIC PROJECTION
Orthogonal photographic projection, Cracovia, 1990
- INSTRUMENT FOR AUTOMATIC SURVEY LFE
The automatic survey LFE, Firenze, 1995