Helps apprentice, journeyman, and master candidates prepare for state examinations covering general mathematics, installation principles, materials standards, and plumbing codes.

Jules A. Oravetz was a professional engineer and the author of numerous books for the plumbing and pipefitting trades, as well as those for building, grounds, and garden maintenance.

Rex Miller was a Professor of Industrial Technology at The State University of New York, College at Buffalo for more than 35 years. He has taught on the technical school, high school, and college level for more than 40 years. He is the author or coauthor of more than 100 textbooks ranging from electronics through carpentry and sheet metal work. He has contributed more than 50 magazine articles over the years to technical publications. He is also the author of seven Civil War regimental histories.