Distribution Department, Low Service Pipe Lines, 30-inch Venturi meter tube removed from Walnut and Pearl Streets, showing condition of interior; inlet end looking toward throat, Somerville, Mass., Aug. 9, 1916

Distribution Department, Low Service Pipe Lines, 30-inch Venturi meter tube removed from Walnut and Pearl Streets, showing condition of interior; inlet end looking toward throat, Somerville, Mass., Aug. 9, 1916

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