… Glass envelopes (including bulbs and tubes), open, and glass parts thereof, without fittings, for electric lamps and …
Explanatory notes
… envelopes (including bulbs and tubes), open, and glass parts thereof, without fittings, for electric lamps and … coated with fluorescent material, etc. Glass parts of envelopes (such as face-plates or cones of … By means of a series of operations (including, insertion of filaments or electrodes, exhaustion of the envelope, …