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AB-129 = A 109 Hz adjustable up top g 194, without foot (not illustrated) AB-130 = A 109 Hz adjustable up to g 194, with foot, pattern König AB-131 = c 128 Hz adjustable up to h 240, with foot, pattern Lucae AB-132 = c 128 Hz adjustable up to h 240, without foot
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medical tuning forks
cosmic tuning forks
