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Title: Early example of a Sigma mechanical comparator with workings [Go to resource]
Description: Early example of a Sigma mechanical comparator with workings visible. Made 1945-1955 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: mechanical comparator Temporal: c. 1940 Source: Science Museum Creator: Sigma Instrument Co. (maker) Identifier: 1993-1532 Go to resource More Like this...
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