Assertion: alloy's nickel | /r/ObjectUse | used in microphone capsules
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Source sentences:
text: Nickel is used in many specific and recognizable industrial and consumer products, including stainless steel, alnico magnets, coinage, rechargeable batteries, electric guitar strings, microphone capsules, plating on plumbing fixtures, and special alloys such as permalloy, elinvar, and invar.