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Mechanical hydro servo valve
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Patent number 4,178,836
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Issue date Dec 18, 1979
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Canron Inc.
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Hubert Maisonneuve
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Undercutter with rotary trencher
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Patent number 3,967,396
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Issue date Jul 6, 1976
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Canron, Inc.
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Hubert Maisonneuve
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES