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Gebärdensprache

Gebärdensprache

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Roman "concrete"
Drilled core from the oldest foothills pipeline to Cologne.
The aggregate material of quarry stones up to the size of a child's fist and the careful tamping achieved a wall quality that is difficult to surpass even with today's materials.
Compressive strength tests on material samples from the Cologne foothills pipeline revealed values between 5 and 40 N/mm².
(Private collection)