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Ralf Tossenberger: P6 Petzval-type
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Ralf Tossenberger: P6 Petzval-type 1
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Ralf Tossenberger: P6 Petzval-type 2
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Ralf Tossenberger: P6 Petzval-type 3
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Ralf Tossenberger: P6 Petzval-type 4
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Ralf Tossenberger: P6 Petzval-type 5