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Troubleshooting and Servicing Modern Air Conditioning and Ref... by John Tomczyk Refrigeration and Air Conditioning Technology by John Tomczyk System Diagnostics and Troubleshooting Procedures by John Tomczyk Refrigeration and Air Conditioning Technology by Bill Johnson Basic Refrigeration & Charging Procedures by John Tomczyk The HVAC/R Professional's Field Guide to Universal R-410a Saf... by John Tomczyk Refrigeration & Air Conditioning Technology DVD Set by John Tomczyk Refrigeration & Air Conditioning Technology Student DVD Set by John Tomczyk Bundle by John Tomczyk Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrige... by John Tomczyk


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