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Title: Sigma mechanical comparator fitted with a perspex cover to r [Go to resource]
Description: Sigma mechanical comparator fitted with a perspex cover to reveal workings and with the original instrument cover; complete with an inspection fitting on the instrument platform; dated 1940 to 1950. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: mechanical comparator Temporal: 1940-1950 Source: Science Museum Creator: Loxham, John (designer) Identifier: 1973-404 Go to resource More Like this...
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