Field briefing
F17B · Gas-holders of variable capacity
Gas-holders of variable capacity. Patents classified in CPC F17B, part of Engines, machines, heating and lighting.
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Dates, owners, statuses and filings come from the published records. Derived views are counted from them. Highlighted text is a plain-English AI reading, written from a patent's title and abstract. Legal statuses and expiry dates are estimates, not legal advice.
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