Scientific instruments and apparatus for testing and verifying the composition and authenticity of coins, bullion, and precious metals using acoustic resonance and vibration analysis, namely, holders specially adapted for holding coins, bullion, and precious metal items during such testing and analysis.

'acoust':20 'adapt':28 'analysi':24,41 'apparatus':4 'authent':12 'bullion':15,32 'coin':14,31 'composit':10 'hold':30 'holder':26 'instrument':2 'item':36 'metal':18,35 'name':25 'precious':17,34 'reson':21 'scientif':1 'special':27 'test':6,39 'use':19 'verifi':8 'vibrat':23

PING PAD

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