| WHITE PAPERS | |
| Pipe Joining Methods Source: Working Pressure » Official Magazine of ASSE International (workingpressuremag.com) |  |
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NSF 61 & 372 Explained Coauthored by: John Higdon & Marcus Estrella |
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| Press Technology (Press Fittings & Valves): Understanding the Press Tools & Profiles by Marcus Estrella | |
