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2017-09-10 Industrial & Microwave Valves Volume 1. General, Ignitrons, Thyratrons, Rectifiers 80,143,898 bytes
2017-09-10 Industrial & Microwave Valves Volume 2. Magnetrons, TR and TB Cells, Microwave Switches, Spark Gaps, Miscellaneaus 67,064,077 bytes
2017-09-10 Industrial Valves & Cathode Ray Tubes. High Power Valves, Low Power Valves, Rectifiers and Thyratrons, Special Quality Valves, Electron Optical Devices, Miscellaneous 128,746,074 bytes