"Shetack" Engineers DTC Chart Circular Conversion Gauge
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DTC (drilling, tapping and clearing) Engineers Chart with conversions for drill sizes including clearing and tapping drills. This example in our collection is marked 2nd ED. Sept. 1938. Date : 1938Manufacturer : Shetack Construction Format : Circular Sliding Chart Physical Description : Conversion chart, Soft case This exhibit has a reference ID of CH10728. Please quote this reference ID in any communication with the Centre for Computing History. |
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