Drilldown: Patents

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Patents > Grant date: April 1909 & Number of figures: 0-20

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None (3) · Johannes Heinze (2) · Jean-Baptiste-Eugène Gangler (2) · Richard Lehmann (2) · Martinus Sieveking (2)
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None (4) · Johannes Heinze (2) · Jean-Baptiste-Eugène Gangler (2) · Richard Lehmann (2) · Martinus Sieveking (2)
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