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This is probably one of the wharves belonging to the American Agricultural Chemical Company, which had built a large fertilizer plant in East Searsport in 1907. The long pier and its housing are one of two such facilities at the complex. The wharf was probably fitted with tracks for trolley transport of the casks in to shore. The gantry offloads lime in casks from a Rockland Rockport Lime Company steel schooner barge called "Number Six". The lime would be used as an ingredient in the fertilizer produced at the Searsport plant.