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Rotary Converter, IRT Subway, Substation 13, Midtown Manhattan, NYC, 2017.

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@lobingera @mattblaze
Yup, noise indeed
It was said that the older pilots who grew up with rotary inverters on the flight deck developed 400hz tinnitus (which I was told could be mitigated by ANR inverting that noise - but I’m not so sure)

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