submitted by Arnwine.Tera 476 days ago (via mattkanebelfast.blogspot.co.uk)
The level includes a petrographic (to geological) evaluation; but this particular are never part out of the durability screening. It is actually included to allow the origin of slates inside try to be planned if there is a dispute about the origin. It should never be called increase in one specification in order to determine if the best slate looks technically suitable.
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