| 1 | He is busy (in) etching. | |
| 2 | A design is etched on a copperplate. | |
| 3 | Unlike the Etch A Sketch, their technique did not involve scraping. | |
| 4 | The technology used for making the objects is that of bending metal tubes and wood etching. | |
| 5 | These channels, which have a diameter of 50 microns (about the width of a human hair) are etched using standard silicon fabrication. |
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