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Title: High visibility precision target by Hilger & Watts Ltd, with [Go to resource]
Description: High visibility precision target by Hilger & Watts Ltd, with tribrach, in wooden case. Mid 1940s License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1943-1948 Source: Science Museum Creator: Hilger & Watts Ltd. (maker) Identifier: 1993-789 Go to resource More Like this...
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