Explanatory notes
… used for the mesh are horsehair, man‑made monofilaments, silk yarns, spun gut, wire (steel, iron, brass wire, etc.). … laboratories (to test fineness of cement, moulding sands, fertilisers, wood flour, etc.), including those which can be … with a perforated sheet‑metal bottom; funnels fitted with a filtering device; milk strainers; strainers for filtering …
