BlackBoard
A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, better known as chalk.
Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
BRAILLE
- 2022-01-31T00:00:00.000000Z
Liberi
- 2021-07-22T00:00:00.000000Z
Vernice
- 2019-04-18T00:00:00.000000Z
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