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(up)date item size
2017-09-30 Electron tubes for TV and radio broadcast. 32,147,105 bytes
2017-09-30 Micro Wave Tubes for Telecommunications. 11,024,235 bytes
2017-09-30 Power Grid Tubes for Scientific Applications. 12,602,350 bytes
2017-10-02 Extending Transmitter Tube Life. 2,107,845 bytes
2017-10-02 Safety Warnings to end users - risks associated with Electron Tubes. 1,749,178 bytes