泛黄羊皮纸上的复杂机械专利图

Create a vintage patent-style technical illustration of a complex mechanical device on aged cream parchment paper. Black ink linework with sepia accents, hand-lettered labels, cross-section views, numbered component callouts, official patent border frame with fake patent number and date. Style of 1890s mechanical engineering drawings. Elegant, authoritative, museum-worthy.