Lokacin da wani mai samar da fenti na kayan shafa na dindindin a Poland yake buƙatar injin niƙa mai nauyin lita 0.5–3, ba mu sayar masa da injin niƙa mai "kyau" ba. Mun sayar masa da kwarin gwiwar sarrafa shi. Karanta cikakken labarin yadda muka daidaita injin dakin gwaje-gwaje da ya dace da buƙatunsa na bincike da ci gaba.
Maxwell ya aikata fa'idodin masana'antu a duk faɗin duniya, idan kuna buƙatar injin haɗin, masu don injunansu, ko mafita don layin samarwa, don Allah ku ji kyauta don tuntuɓar mu.