Vanasti, kui võrke valmistati veel puuvillasest niidist, tõrvati neid, et võrk niiskusele paremini vastu peaks ega läheks mädanema. Tänapäeval valmistatakse võrgud sünteetilisest materjalist, mis on vees vastupidav ning tõrvamist ei vaja.
27.06 Tar distilled from coal, from lignite or from peat, and other mineral tars, including partially distilled tars and blends of pitch with creosote oils or with other coal tar distillation products:
01 Net tar and the like for the manufacture of nets, subject to compliance with definition and decision of the Ministry of Finance
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