Composed of images and text. Models represented: Elna Lotus EC - economy, Elna Lotus ZZ- zigzag, Elna Lotus SP - special. Title from cover. Photos of machines, Elna lotus EC - economy; Elna lotus ZZ- ...
For much of the nineteenth century, inventors submitted a model with their patent application to the United States Patent Office. The National Museum of American History’s patent model collection ...
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