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LaFarge North America Inc., Bingham Farms, MI

Lake Michigan Contractors Inc., Holland, MI

Lakehead Tugboats Inc., Thunder Bay, ON

Lakeshore Towing Services Inc., Erie, PA

Lambton Marine Ltd., Port Lambton, ON

Luedtke Engineering Co., Frankfort, MI

Luhr Bros. Inc., Columbia, IL

Lyons Marine Construction, Charlevoix, MI

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