চিত্র:Kugleramme.jpg

উইকিপিডিয়া, মুক্ত বিশ্বকোষ থেকে

Wikimedia Commons logo এই ফাইলটি উইকিমিডিয়া কমন্‌স থেকে নেয়া। সেখান থেকে নেয়া ছবিটির বিশদ বর্ণনা নিম্নে প্রদর্শিত হল।
  • en: An abacus from a Danish elementary school. Early 20th century. Size: 40 cm wide, 46 cm high.
  • es: Un ábaco de una escuela elemental danesa. Principios del siglo XX. Tamaño: 40 cm ancho, 46 cm alto.
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