Umlawuli Wesikwele Segranite
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I-Granite Square Ruler enezindawo ezine zokunemba ezi-4
Ama-Granite Square Rulers akhiqizwa ngokunemba okuphezulu ngokwezindinganiso ezilandelayo, kanye nokulutha kwamamaki aphezulu okunemba ukuze kwaneliswe zonke izidingo zomsebenzisi ezithile, kokubili eshabhu noma egumbini le-metrological.