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Externally changeable flail apparatus
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Patent number 5,638,879
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Issue date Jun 17, 1997
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Wood Technology, Inc.
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Milan W. Robison
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...
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Flail drum machines and methods
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Patent number 5,322,104
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Issue date Jun 21, 1994
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Wood Technology, Inc.
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Norval K. Morey
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...
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Flail drum system
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Patent number 5,148,844
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Issue date Sep 22, 1992
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Chiparvestors, Inc.
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Milan W. Robison
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...