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Title: Mining surveying level target, British,1930 [Go to resource]
Description: Simple pattern mining target or movable bench mark by E. R. Watts & Son Ltd, London, England, c.1930. With possible accessory. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: bench mark Temporal: 1930 Source: Science Museum Creator: E. R. Watts & Son Ltd Identifier: 1932-50 Go to resource More Like this...
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