Joseph Hardtmuth - Wikipedia
Joseph Hardtmuth - Alchetron, The Free Social Encyclopedia
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Koh-i-noor Hardtmuth
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Biografien - Wiener Weltausstellung
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9783205053231: Joseph Hardtmuth, 1758-1816: Architekt und Erfinder (German Edition) - Wilhelm, Gustav: 3205053230 - AbeBooks
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