Footnote

a I-ISO sisifinyezo seInternational Standards Organization; iASA sisifinyezo seAmerican Standards Association. Kwiindawo ezithile zaseYurophu, kukwasetyenziswa iDIN (Deutsche Industrie Norm). Ifilimu ebhalwe ngokuthi ISO 100/21 yiASA 100 okanye i-21 DIN.