Explanatory notes
… other fused silica 7017.20 - Of other glass having a linear coefficient of expansion not exceeding 5 x 10 -6 per Kelvin … etc.), special tubes (gas washing, drying, condensation, filter, gas burettes, test-tubes, etc.), stirrers, … heading 96.17 ), wash-bottles, stop-cocks, spatulas, jars (filtering, precipitating, multinecked, etc.), muffles, …