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Title: Three Cadmium sulphide photo cells: Mullard ORP12 (c [Go to resource]
Description: Three Cadmium sulphide photo cells: Mullard ORP12 (c.1960); Mullard RPY58 (c.1965); Clair CL705 light spot movement detector (c.1965) License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1990-506 Go to resource More Like this...
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