46 Whitworth cylindrical plug gauges and 2 gauge plates - 15 BG to 31 BG made to Board of Trade Standards and kept in a case; 1914
- Industrial Metrology
- Object Number:
overall open: 10.6299 x 16.9291 x 7.874 in.; 27 x 43 x 20 cm
- plug gauges
- Board of Trade
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