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Title: manometric spirit level [Go to resource]
Description: Spirit level, manometric, for rail gradient, probably by Abtus, England c.1960. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: spirit level Temporal: 1955-1965 Source: Science Museum Creator: Abtus Identifier: 1992-7361 Go to resource More Like this...
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