| More topics under "F17 - Storing or distributing gases or liquids" (55,670) |
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| F17B - Gas-holders of variable capacity (683) |
| F17C - Vessels for containing or storing compressed, liquefied, or solidified gases; Fixed-capacity gas-holders; Filling vessels with, or discharging from vessels, compressed, liquefied, or solidified gases (38,884) |
| F17D - Pipe-line systems; Pipe-lines (16,103) |