DIN 21521-2 Rock bolts for mining and tunnel support; general specifications for steel-bolts; tests, testing methods. Формат поставки-PDF. Язык стандарта-Немецкий
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DIN 21521-2 Rock bolts for mining and tunnel support; general specifications for steel-bolts; tests, testing methods
Язык:
Немецкий
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PDF
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