Disk
1.great dina kawat diaguna <2 mm
Tingkat produksi 2.
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1. Bahan spring spring: baja cinyusu, bijat storial, karbon luhur, kawat galvanzed, baja hampang, centile anu luhur
2. Cincin spring anu tiasa)
Moyer, QuD, WAFIOS, Drub, Herckelbout, hack, Bamatesec, Kamatisech sareng Bennet.