1. Arredondo Alonso. Technique for determining thread accuracy. U.S. Patent No. 4,590,678, 1986.
2. Storace Anthony, Yannella Albert V. Thread measurement tool. U.S. Patent No. 4,672,750, 1987.
3. Masselink John. Screw thread measuring device. U.S. Patent No. 5,214,856, 1993.
4. Brunson Gordon. Thread pitch diameter measuring system. U.S. Patent No. 6,145,207, 2000.
5. Castore Glen M, Treiber Frederick A, Drake Barry L. Laser scanning method and apparatus for rapid precision measurement of thread form. U.S. Patent No. 5,521,707, 1996.