Widyotomo, S. 2006. Optimation of a Table Conveyor Type Grading Machine to Increase the Performance of Green Coffee Manual Sortation. Pelita Perkebunan (a Coffee and Cocoa Research Journal). 22, 1 (May 2006). DOI:https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v22i1.28.