This National Radio Institute Radiotrician Binder set from the 1940s is a valuable addition to any collection. The two hardcover binders contain a wealth of information on radio technology and repair, written in clear and concise English. The book series is a testament to the quality of the National Radio Institute's educational materials, and the topics covered in this set are sure to be of interest to anyone interested in radio. Whether you are a collector, a radio enthusiast, or simply looking to expand your knowledge, this set is a must-have.