Answer:
Generators, motors, and transformers.
Electric buzzers and bells.
Headphones and loudspeakers.
Relays and valves.
Data storage devices like VCRs, tape recorders, hard discs, etc.
Induction cooker.
Magnetic locks.
MRI machines.
Explanation:
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Astrolabe? I’m guessing that because I know that those helped sailors avoid the wind in a certain direction but I could be wrong.
Instrumental is the best answer in my opinion