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Box tube clamping system
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Patent number 6,755,590
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Issue date Jun 29, 2004
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MTR, Inc.
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Edwin J. Luetzow
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Solenoid system
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Patent number 6,597,558
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Issue date Jul 22, 2003
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MTR, Inc.
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Edwin J. Luetzow
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H01 - BASIC ELECTRIC ELEMENTS
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Bi-stable battery switch
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Patent number 6,310,529
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Issue date Oct 30, 2001
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MTR, Inc.
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Edwin J. Luetzow
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H01 - BASIC ELECTRIC ELEMENTS