E. g. : instrument processing and cutting of metal signs, ironing boards, atomic stamps, carbon plate in battery, copperstamp and small artworks.
如:仪器加工,金属标牌、烫金板、原子章、电池碳板、铜章、小型工艺元件切割等;
2
The first publication adopting photogravure single-color printing method. Letterpress printing, copperstamp, relief printing and manual feed were used.