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Title: Deflection magnetometer compass by Townson and Mercer Ltd. [Go to resource]
Description: Deflection magnetometer compass by Townson and Mercer Ltd. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1900-1939 Source: Science Museum Creator: Townson and Mercer (maker) Identifier: 1984-935 Go to resource More Like this...
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