(1) operasi manual polishing mechanical: punika dening nglereni, ewah-ewahan bentuk plastik lumahing materi dibusak sawise polishing convex lan lumahing Gamelan cara polishing, umume nggunakake lenga, wool wheel, sandpaper, etc, wis diwenehi prioritas kanggo karo operasi manual, bagean khusus kayata minangka permukaan rotary, ...
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