Image: NBS 120 Set
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NBS_120_Set.jpg (274 × 222 pixels, file size: 23 KB, MIME type: image/jpeg)
Description: Sketch of Crystal Set
Title: NBS 120 Set
Credit: Scanned image from NBS Circular 120 dated 1922, cleaned it up with Photoshop.
Author: Davidson
Permission: expired copyright
Usage Terms: Public domain
License: PD
Attribution Required?: No
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