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2990970
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Patent Grant
2990970
References
Source
Patent Number
2,990,970
Date Filed
Not available
Date Issued
Tuesday, July 4, 1961
63 years ago
CPC
F17B1/007 - with telescopically movable ring-shaped parts
F17B1/00 - Gas-holders of variable capacity
US Classifications
220 - Receptacles
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