12-02-2011, 09:43 AM
Dear friends,
Does anyone has the following DINs:
Standard DIN 21521-1 Rock bolts for mining and tunnelling; terms.
Standard DIN 21521-2 Rock bolts for mining and tunnel support; general specifications for steel-bolts; tests, testing methods.
Thank you in advance.
Does anyone has the following DINs:
Standard DIN 21521-1 Rock bolts for mining and tunnelling; terms.
Standard DIN 21521-2 Rock bolts for mining and tunnel support; general specifications for steel-bolts; tests, testing methods.
Thank you in advance.