electron Tube Data sheets
	Watkins-Johnson documents

(up)date	item	size
2017-11-20	Electron Devices, Electrinic Systems, 1963. Noise Generators, Traveling Wave Amplifiers, Tunable Filters, Backward Wave Amplifiers (385 pages)	149,545,201 bytes
2019-04-06	Microwave Devices Technical Data, 1972, 654 pages.	111,537,405 bytes
2021-03-20	Microwave Devices Technical Data, 1971, 576 pages.	200,332,612 bytes