Chimiro cheBrand Nanpi Hardware chimiro chebrand chakagadzirirwa boka remabasa esimbi muDunhu reNanpi, Hebei, kuChina. Mucherechedzo uyu unosanganisa sikweya nedenderedzwa zvakadhirowewa nejometri inogunzvana. Chimiro chinobuda chinoverengeka segedhi uye zvakare sechinangwa chekunanga, chichiratidza ungwaru hwakanangana. Nzvimbo yakazara inoratidza bhii N, uye buri rakayerwa zvakanaka rinoratidza bhii P munzvimbo isina chinhu. Ongororo yezviyero zviviri yakabudisa mhando zvitanhatu nemakumi mana nenomwe (147), imwe neimwe yakaedzwa kujeka pa10 mm. Jometri iyi inotsigirawo totem yemativi matatu ine maonero ayo makuru anoenderana nelogo yakati sandara.