The NC drill files, with the file extensions .drd, .dri, and .whl, are Excellon NC drill files.
A project log for Visually Impaired Pulse Echo Ranging (VIPER)
A technology for helping those whose vision is impaired to more easily navigate through their local environments
The NC drill files, with the file extensions .drd, .dri, and .whl, are Excellon NC drill files.
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