GBP
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/Measuring Tools/Small Tool Instruments/Thread Gauges/BSW (British Standard Whitworth) Thread Gauges
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BSW (British Standard Whitworth) Thread Gauges
https://www.cutwel.co.uk/measuring-tools/small-tool-instruments/thread-gauges/bsw-british-standard-whitworth-thread-gauges
https://www.cutwel.co.uk/media/catalog/category/Untapered_JBO_Only.jpg
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