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(up)date item size
2013-09-21 Photo Multiplier Tubes 1970. ☆Alan Sayer13,632,373 bytes
2013-09-21 Photo Multiplier Tubes Supplement 1972. ☆Alan Sayer13,329,428 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
2017-12-27 Valve Division - Valve Manual ~1960. 365 pages.