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Title: lyr thread cutting tap [Go to resource]
Description: Tap, tapered, thread cutting, steel, 2 1/8" Whitworth, worn, Lancashire & Yorkshire Railway, for wash-out plugs, 1900-1922 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: tap Temporal: 1900-1922 Source: Science Museum Identifier: 1997-7738 Go to resource More Like this...
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