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US2230388A
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Method for laying in yarn on cotton type of knitting machine
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US2139607A
|
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Knitted fabric
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US2139137A
|
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Filter type respirator
|
|
US2111995A
|
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Respirator
|
|
US2153437A
|
|
Respirator
|
|
US2114358A
|
|
Filter type respirator
|
|
US2174370A
|
|
Respirator
|
|
US2160317A
|
|
Respirator
|
|
US2176380A
|
|
Respirator
|
|
US2181026A
|
|
Respirator
|
|
US2106257A
|
|
Filter for filter type respirators
|
|
US2102037A
|
|
Filter type respirator
|
|
US2112213A
|
|
Filter type respirator
|
|
US2070754A
|
|
Respirator, gas mask, and the like
|
|
US2067026A
|
|
Respirator
|
|
US2070241A
|
|
Filter type respirator
|
|
US2055853A
|
|
Separator for filter type respirators
|
|
US2029129A
|
|
Means for and method of connecting an exhalation valve, separator, or similar element with the face piece of a respirator, gas mask, or the like
|
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US2062834A
|
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Filtering device or separator for filter type respirators or the like
|
|
US2035097A
|
|
Separator for filter type respirators or the like
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