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Title: Mullard four-electrode ("space-charge grid") valve, type PM1 [Go to resource]
Description: Mullard four-electrode ("space-charge grid") valve, type PM1DG, c.1928 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1985-39 Go to resource More Like this...
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