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United States Patent 2971671
US Patent References:
Vacuum indicator for sealed cans and the like
- - 1570732

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- - 1913652

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- - 2012213

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- - 2027430


Inventors:
Shakman, James G.
Publication Date:
02/14/1961
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Assignee:
PABST BREWING CO
Primary Class:
220/624
Other Classes:
220/906, 220/609, 53/403