The 1849 safety pin: one bent wire
A patent-style drawing of the safety pin: the coil spring, the clasp and the covered point drawn in white with a section A–A, then the red pencil strikes out "2" pieces in the title block and writes "1 wire", and circles the clasp that keeps the point covered.
Blueprint Patent16:9 · 30fps · 10.0s · en/US
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Example request
Explain the safety pin as a patent drawing: it looks like two parts, but the design patented in 1849 is one wire, bent into a coil spring and a clasp that keeps the point covered.