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PCE
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CPC Subgroup
F17B 1/007

with telescopically movable ring-shaped parts (F17B1/10 takes precedence; sealing of rings F17B1/04)

Full Title

Gas-holders of variable capacity (large containers in general B65D88/00; storing fluids in natural or artificial cavities or chambers in the earth B65G5/00) > with telescopically movable ring-shaped parts (F17B1/10 takes precedence; sealing of rings F17B1/04)