2023: I'm going to guess that it's an updraft carburetor from a dual-
fuel tractor that is started using gasoline and then switched to
cheaper tractor fuel/distillate when the engine is warmed up.
2025: The tank from a kerosene wick stove. A modern example is here:
2026: Pigeon racing clock.
2028: Magnetic sweeper for picking up foreign objects from an
Hmm ... I can only see it as being useful for ferrous metals,
not for aluminum, titanium, brass or bronze.
And given that airframes are often made of aluminum or titanium
(for weight reasons), with ferrous metals only used where needed,
explicitly engine cylinders and blocks, shafts to propellers, and likely
some parts of the landing gear. One may presume that the metals to be
picked up are results from crashes -- though the results of a bomb
detonation is likely too -- and that is most likely ferrous.
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