“I found these in my grandmother’s house (Germany), they are made of thin glass. Unfortunately, there is no box cover explaining what they are.”
"They are for flower decoration. One singular flower goes in the tube. There is probably a stand for them somewhere around, but some people like to stick them in foam together with other decorations, or in pieces of driftwood with holes drilled into them, or even into other flowerpots.
I saw very similar ones in the Bodenmais Glasmanufaktur."
...film container. No mine has this particular imprint on the housing. For pressure you install AP or frog type device under, and pressurize with AT.
They are used all over to prevent damage to ships in general.
We use yokohama fenders while repairing the regular fenders on the jetty.