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Title: Silica, hard vacuum, thermionic triode valve: K5875/NT57T M6 [Go to resource]
Description: Silica, hard vacuum, thermionic triode valve: K5875/NT57T M677 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1992-422 Go to resource More Like this...
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