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Title: Type TR photocell, produced on behalf of Vacuum Physical Lab [Go to resource]
Description: Type TR photocell, produced on behalf of Vacuum Physical Laboratories License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: Photocell Temporal: 1940 Source: Science Museum Creator: Tomes, G Identifier: 2003-82 Go to resource More Like this...
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