Wittybebop
**Member**
Posts: 32
What I collect: Anything GB mint
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Post by Wittybebop on Jul 16, 2023 16:54:20 GMT
From an article date unknown "Mr York from Harrisons talked about coil strips being perforated by the Lawnmower process due to having Gum Arabic, however circular perforation are by no means the most efficient and testing has taken place using Diamond shaped holes and has proved most suitable under test conditions"
Obviously this for some reason never got off the ground I wonder what the outcome was?
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