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Computer-aided drawing or engraving device
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Patent number 4,625,410
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Issue date Dec 2, 1986
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Franz Kuhlmann Prazisionsmechanik und Maschinenbau GmbH & Co. KG
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Hans Eder
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Two-axis positioning system
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Patent number 4,507,598
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Issue date Mar 26, 1985
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Matsushita Electric Industrial Co., Ltd.
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Noriaki Wakabayashi
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G05 - CONTROLLING REGULATING
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Stylus changing device
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Patent number 4,288,798
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Issue date Sep 8, 1981
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Goerz Electro Gesellschaft m.b.H.
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Walter Hollmayer
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3143804
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Patent number 3,143,804
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Issue date Aug 11, 1964
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES