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2
Early Prototype Bone Conduction (Non-Commercial)
These early prototypes were the foundation of the entire bone conduction industry. They were large, clunky, and often required external amplifiers to function. They were never intended for consumer us...
5.0
Average
3
Hughes YAH-64
The Hughes YAH-64 was a prototype attack helicopter that served as a precursor to the Apache. It featured a tandem cockpit and advanced avionics for its time. Although it ultimately lost out to the Be...
4.8
Poor
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