[REQUEST] DIN 21521-1 & 21521-2 Rock bolts for mining and tunnelling

[wobmot]

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.

[ziggywas1]

German editions

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