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2013-09-21 Photo Multiplier Tubes 1970. Thanks to Alan Sayer. 13,632,373 bytes
2013-09-21 Photo Multiplier Tubes Supplement 1972. Thanks to Alan Sayer. 13,329,428 bytes
2017-09-09 Product Information Catalog - Electron Tube Division Photo Multiplier Tubes, Photo Diodes, Camera Tubes, Cathode Ray Tubes, Image Intensifiers 63,120,580 bytes
2017-09-09 Product Information Catalog - Valve Division Photo Multiplier Tubes, Micro Wave Tubes, Camera Tubes, Cathode Ray Tubes, Image Intensifiers 84,224,195 bytes