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Title: Experimental micrometer [Go to resource]
Description: Experimental micrometer using Ayrton-Perry magnifying spring to read to 1/20,000 of an inch; patented in1909. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: micrometer Temporal: earliest 1909 Source: Science Museum Identifier: 1909-81 Go to resource More Like this...
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