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4-chord zithers
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Menzenhauer 4/15 chord-zither (#0 1/2)
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Phonoharp 4/15 chord-zither (#1)
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Phonoharp 4/15 chord-zither (#2)
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| Phonoharp 4/15 chord-zither (#2 1/4)
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Menzenhauer 4/15 chord-zither (#2)
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Phonoharp 4/16 chord-zither ("Yendrick's Club Special")
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Schmidt 4/16 chord-zither ("Hawaiian Mandolin Harp")
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Later Schmidt "standard" 4/16 chord-zither
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Early Phonoharp 4/17 chord-zither
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Phonoharp 4/17 chord-zither (#2 1/2)
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Phonoharp 4/30 chord-zither
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Menzenhauer 4/30 chord-zither
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Schmidt 4/30 chord-zither
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Marx Co. 4/30 chord-zither
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