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Title: Enlarged x-ray photograph of electrode system of KTW.61 valv [Go to resource]
Description: Enlarged x-ray photograph of electrode system of KTW.61 valve, 1946. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1946 Source: Science Museum Identifier: 1947-36 Go to resource More Like this...
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