used by tanners to produce a soft leather
... that either dog feces, or hen and pigeon manure, were used by tanners to produce a soft leather?
... that either dog feces, or hen and pigeon manure, were <b id="mw2g"><a href="./Bating_(leather)" id="mw2w" rel="mw:WikiLink" title="Bating (leather)">used by tanners to produce a soft leather</a></b>?