These are amazing pictures and show the Nissen Stamp patented by Georg Nissen and their better performance proved by Peter Norman Nissen in the Rand (South Africa) when Peter Nissen was indentured to Head Wrightson (Liverpool) just before the first World war, when he joined the British Army and then invented the Nissen Hut.
Key Improvement.
The key improvement was that using a circular stamp in a circular bed was much more efficient than the rectangular trough which exited before.
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