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Driving unit for vertical pump
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Patent number 4,087,211
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Issue date May 2, 1978
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Sigma Lutin, Narodni Podnik
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Frantisek Pochyly
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E21 - EARTH DRILLING MINING
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Drawing die for elongated twist bodies
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Patent number 4,055,073
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Issue date Oct 25, 1977
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Sigma Lutin, Narodni Podnik
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Oldrich Langr
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Hydrodynamic multi-stage pump
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Patent number 3,986,791
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Issue date Oct 19, 1976
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Sigma Lutin, Narodni Podnik
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Alexander Paciga
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Impeller blades
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Patent number 3,964,841
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Issue date Jun 22, 1976
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Sigma Lutin, Narodni Podnik
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Oldrich Strycek
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES