Nhazi ọkọlọtọ:
Ịtụ, kpọgidere akpa, ịmachi akpa, na ibuga
Usoro ntinye:
Ejikọtara ahụ ọnụ ọgụgụ na ebe nchekwa ahụ ozugbo na-enweghị okpokolo agba akwado.Emebere igwe igwe n'ụdị ergonomic dị mma iji chekwaa ụgwọ ọrụ yana melite arụmọrụ ọrụ.
Uru igwe:
Dị mfe, ọsọ dị elu, nkenke dị elu, nhazi dị mfe na arụ ọrụ na-aga n'ihu.
Njirimara igwe:
1.A ihe njikwa ihuenyo mmetụ aka nwere arụmọrụ kwụsiri ike, izi ezi dị elu, mgbazi dobe akpaka, nchọpụta enweghị ndidi, na nchọpụta mmejọ.
2.The-atụ ịwụ na-wuru n'ime, na-azọpụta osisi ohere.
3.The igwe nwere eriri nri usoro, nke nwere ike ịgbanwe ọsọ.
4.The ihe kọntaktị akụkụ bụ ire ụtọ, eyi na-eguzogide ọgwụ, nwere ezi fluidity, elu ịdị ọcha ụkpụrụ, corrosion iguzogide, na ogologo ngwá ọrụ ndụ.