| http://www.w3.org/ns/prov#value | - Uwe developed his own tooling and technique independently, and while in both their cases the ability to drill smoothly curved smoke passages allows for both more freedom in design and for easier cleaning (as a pipe-cleaner will pass through with ease), in Jopp's case he also particularly notes that this technique helps retain more substance to both the transition, and the edges of the draft-hole (
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