White line on Prussian blue, with a real title block.

Technical blueprint and cyanotype diagrams — white line on Prussian blue, dimension arrows, callout numbers, title block. Use for patent-style drawings, exploded views, how-it-works diagrams, architectural elevations and any request for blueprint, schematic, cyanotype or engineering-drawing output.
The exact brief that produced the image above.
Vintage cyanotype blueprint on aged Prussian blue paper with uneven wash and faint water staining. A white line-drawing exploded view of a bicycle hub gear, parts separated along a horizontal axis with thin leader lines and small circled callout numbers one through six. Fine dimension arrows with tick ends. A ruled title block in the lower right with tiny uppercase lettering. White line only, no fills, no shading, no colour other than the blue paper.
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