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Kumanga Tunnel
Malo ogwirira ntchito pansi panthaka nthawi zonse amakhala ovuta, makina athu obowola omwe amatha kusuntha kuti akuthandizeni kugwira ntchito motetezeka. Chisamaliro chapadera chiyenera kuperekedwa ku khalidwe la mpweya m'malo ocheperapo ogwirira ntchito mobisa. Ma compressor a mpweya amatha kugwiritsidwa ntchito ngati gwero lamphamvu la pneumatic, kuyeretsa ...Werengani zambiri
