Associated Factory Mutual Fire Insurance Companies. Independent Lock Company "Plants Nos. 2 & 3," Fitchburg, Mass. Boston, Mass.: Associated Factory Mutual Fire Insurance Companies, 1949. Surveyed February 3, 1949. Surveyed by J. E. L. Dugas; traced by S. E. Hicks. 1 sheet. Includes plan of buildings (with dimensions), elevation views of individual buildings (with functions of building floors and rooms), and surroundings, including numerous dwellings. Also includes description of property, power, stock and product (lock cylinders and door check parts), and existing water sources and fire protection resources. Lacks isometric view of buildings. Pencilled in upper right corner: "Cancelled 8-6-57." Serial number 35546 (original survey). Index number 9562-.1. Scale 1:600, 1 in. = 50 ft. 68 x 53 cm. (OCLC)