Potential answers for "Copter predecessors"

⭐⭐⭐⭐ GIROS
⭐⭐ XIS
⭐⭐ LPS
⭐⭐ NUS
⭐⭐ GIRO
⭐⭐ WHIRLYBIRD
⭐⭐ STU
⭐⭐ RSTU
⭐⭐ SLIDERULES

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