This page lists all the various symbols in the Blueprint Symbols category.
A blueprint is a reproduction of a technical drawing, documenting an architecture or an engineering design, using a contact print process on light-sensitive sheets. Invented in the 19th century, the process allowed rapid and accurate reproduction of documents used in construction and industry. The blue-print process was characterized by light colored lines on a blue background, a negative of the original. The process was unable to reproduce color or shades of grey.
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"Blueprint Symbols." Symbols.com. STANDS4 LLC, 2020. Web. 28 Jan. 2020. <https://www.symbols.com/category/38/Blueprint+Symbols>.