Isibuko se-convex sinendawo ebanzi yokujonga kwaye sinokubona ngaphezulu kwesipili esithe tyaba.
Iimfuno zofakelo lwesipili: isibambo sangaphakathi sokubamba sikuluhlu lwe-17.4mm ukuya kuma-22mm ukuze usebenzise. (Iipesenti ezingama-90 zeebhayisikile zeentaba kunye neebhayisikile zendlela zingasetyenziswa)
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Akukho ncomo okwangoku.