Potential answers for "Machinery sound"

⭐⭐⭐⭐ WHIRR
⭐⭐⭐⭐ WHIR
⭐⭐⭐ HUM
⭐ OOMPAH
⭐ SQUAWK
⭐ TUT
⭐ OHO
⭐ AHA
⭐ PTUI
⭐ ECHO

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