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National Fuse Filling Factories were established by the Ministry of Munitions
Original function: spindle factory of Jonathan Hattersley and Son Ltd. Opened: Early 1916. Management: Leeds Munitions Committee which acquired the rights to manufacture the No. 106 fuse from the Leeds Munition Co Ltd. Munitions: No.106 type fuse. Notes: This factory became National Ordnance Factory No. 4.
Original function: unknown. Opened: early 1916. Management: Leeds Munitions Committee. Munitions: assembly and gauging. Notes: became National Ordnance Factory No. 6.
Original function: unknown. Management: Leeds Munitions Committee. Munitions: fuzes. Notes: became National Ordnance Factory No. 5.
Construction started: date unknown. New factory of George Kent Ltd. Opened: June 1916. Management: George Kent Ltd. Munitions: No. 80 fuse.
Construction started 1916 Opened 1917 Management: Board of Management Munitions: Fuses; aeroplane bolts (1918)