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Title: Potential Indicator (No 653) marked "Crompton's" patent [Go to resource]
Description: Potential Indicator (No 653) marked "Crompton's" patent License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Creator: R E Crompton and Company Identifier: 1899-21 Go to resource More Like this...
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