Blowpipe gathering end and camera: what they have in common

1. Step 1. Blowpipe gathering end — is part of — Glassblowing. A thickened end on which the melt is gathered.
2. Step 2. Glassblowing — uses — Glass. Molten glass is blown.
3. Step 3. Glass — is material for — Photographic flash. The bulb is glass.
4. Step 4. Photographic flash — is part of — Camera. A flash.

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