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Playing these types of harmonics is a step beyond Natural Harmonics.
If you have listened to some music by Tommy Emmanuel or Eric Johnson, you are probably familiar to this type of harmonics. It's actually a classical guitar technique and it is a bit similar to the tapped harmonics. Harp harmonics are produced on fretted strings and not with the fretting hand which you use for chords, but with the tip of the index finger of the plucking hand.