NASA NTRS · 19670000283
Concept for modifying drafting instruments to minimize smearing
Abstract
Ball bearing standoffs added to drafting instruments enable the instruments to be moved about, with their surfaces out of contact with the drawing paper. This provides a safeguard against smearing of the lines.
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Rennie, T. A.. 1967-08-01. Concept for modifying drafting instruments to minimize smearing. https://ntrs.nasa.gov/citations/19670000283
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