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121/4" HM652XA matrica tijelo PDC ugrizao / Mirza PDC svrdlo / PDC jezgra bitova s mlaznica/pa bušenje nafte

matrica tijelo pdc svrdlo, ulje dobro bušenje, ugljen ruda, rangiranje zalogaj dijamant bušenje


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121/2 HM662XAG petrol sahası Drill Bit sabit oluşumu için kumtaşı sondaj
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