Control consisting of a mechanical device for controlling the flow of a fluid
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
TIFF (full resolution)
2257×2400, 878.3 KiB
Large GIF
962×1024, 154.7 KiB
Medium GIF
601×640, 81.2 KiB
Small GIF
300×320, 29.0 KiB