1. Mechanisms for controlling the motion of the weft carrying grippers in looms;Genini,1977
2. Mechanism to control the movements of weft insertion members in shuttleless weaving looms;Pezzoli,1986
3. Cutting variable pitch screw conveyers on a modernized screw-cutting lathe;Kucher;Chem. Petrol Engineering,1969
4. Variable pitch screw drives;Gillie;Mechanism and Machine Theory,1978
5. Elevator door operator having a variable pitch lead screw;Robert,1983