Metallide keevitamine ja lõikamine atsetüleeni asendajatega. Ohutustehnika juhend keevitajatele ja lõikajatele propaanibutaaniga töötamisel
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URL: http://www.digar.ee/id/nlib-digar:709593
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URL: http://www.digar.ee/id/nlib-digar:709593
