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S in a black square

Question asked by Fecx Hhtgg on Feb 9, 2017
Latest reply on Feb 9, 2017 by Christian Chu

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does anyone know the meaning of this S?

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Dan Pihlaja Feb 9, 2017 11:23 AM
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Can you give us an idea as to what industry that is from?
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- Fecx Hhtgg @ Dan Pihlaja on Feb 9, 2017 12:27 PM
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  Oil industry. Open drain system.
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  - Christian Chu @ Fecx Hhtgg on Feb 9, 2017 12:33 PM
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    Here is what I found
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Wayne Schafer Feb 9, 2017 11:34 AM
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I believe it means it is a safety weld and has to meet special criteria.
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Christian Chu Feb 9, 2017 11:40 AM
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Never seen it before -
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