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John Helenberg

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Means to rotate spherical plug valve

F - Mech Eng,Light,Heat,Weapons – 16 – K
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Plug for spherical plug valve

F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent

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Steam valve gear

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Tubing sleeve valve

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Patent

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Steam valve gear

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Patent

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Profile ID: LFCA-PAI-P-478709

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