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A new monoterpenoid indole alkaloid from Winchia calophylla Components of Stem Barks of Winchia calophylla A. DC. And Their Bronchodilator Activities Butyl Acetals from Medicinal Plant , Winchia calophylla (Apocynaceae) Loganin Derivatives from Winchia calophylla Triterpenoids from the Dai Medicinal Plant Winchia calophylla STUDIES ON THE SELF-MOVING DOUBLE-DRUM LIGHT WINCH FOR BUNCHING Development of JS3-2 Winch Made Mainframe at Walking Tractor A STUDY ON THE MACHING RELATION BETWEEN DIAMETERS OF DRUMS AND CABLES