Melt-blown filter layer and radio: what they have in common

1. Step 1. Melt-blown filter layer — is part of — Respirator. An electrostatic precipitator.
2. Step 2. Respirator — is made of — Vulcanized rubber. The mask is rubber.
3. Step 3. Vulcanized rubber — is material for — Weather balloon. The envelope is rubber or latex.
4. Step 4. Weather balloon — has part — Radio. A radiosonde.

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