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3471692
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Information
Patent Grant
3471692
References
Source
Patent Number
3,471,692
Date Filed
Not available
Date Issued
Tuesday, October 7, 1969
54 years ago
CPC
G01N30/722 - through a gas permeable barrier (membranes, porous layers)
G01N30/78 - using more than one detector
US Classifications
073 - Measuring and testing
096 - Gas separation: apparatus
250 - Radiant energy
346 - Recorders
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