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The Leaning Tower of Pisa
Reinforcing activities for the historical study of the Leaning Tower of Pisa
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| A | B |
| 1173 | construction began |
| 1350 | construction was finished |
| 54.5 m metric height | 179 ft English height |
| 1274 | leaning became obvious |
| 1,2mm | annual tilt |
| 2200 | predicted collapse |
| 1198 | first bell added |
| 14,700 metric tons | weight of the tower |
| 294 | steps to top of tower |
| 600 tons | lead weight added in 1995 |
| 48.6 m | circumference |
| Berta of Bernardo | left money to build tower |
| 5.2 m | lean in 1995 |
| 1990 | tower closed for 1st time in 800 years |
| 20 m | diameter |
| September 1995 | tower closed till present day |
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