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22 St. 32 Min, 11 Okt 1830 Jahr - doubts about the effectiveness of the Lancastrian system surfaced. With the decline of this teaching method, the use of monitors and sandboxes ended. Later the sandboxes would be replaced by individual slates.

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22 St. 32 Min, 11 Okt 1830 Jahr
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~ 195 years ago
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