S31803 shine tsarin ƙididdigar lamba (mara izini) ƙira don asalin Duplex bakin karfe. Kungiyoyi masu ciniki da yawa sun kirkiro da kungiyoyin kasuwanci da yawa a cikin shekarun 1970 don rage rikicewa yayin da aka kira kowa abubuwa daban-daban, da kuma mataimakinsu. Kowane ƙarfe yana wakilta ta hanyar wasiƙu da lambobi biyar, inda harafin yake wakiltar jerin baƙin ƙarfe, I.e. S for bakin karfe.
Purean bututun karfe sune gaba ɗaya don abubuwan haɗin a tsarin bututun wanda ke taka rawar haɗin, iko, canji, ƙaura, severing, da tallafi. Aiki: Haɗin, shugabanci ya canza, shants, sever, tallafi, sinadarai pipe fyshis ana amfani da shi sosai a cikin maniyyi don ginin masana'antu.
- Zhengzhou Huitong bututun kayan aiki Co., Ltd.