The CASIO PB-410 series
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PB-410
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The first one
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PB-410F
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PB-410 model with access on the back
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FX-720P
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Scientific version of PB-410
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FX-720pF
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Scientific version of PB-410F
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PD-121
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Derived from PB-410f - blank version
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FX-820p
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A FX-720p with integrated printer
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PB-500
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PB-500F
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PB-500F / PD-131
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FX-750p
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Fx-750pF
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FA-20
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Fits to FX-750p (F) and PB-500 (F) models.
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