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US2296516A US258293A US25829339A US2296516A US 2296516 A US2296516 A US 2296516A US 258293 A US258293 A US 258293A US 25829339 A US25829339 A US 25829339A US 2296516 A US2296516 A US 2296516A Authority US United States Prior art keywords tube air briquette forming compression Prior art date 1939-02-24 Legal status (The legal status is an assumption and is not a
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