| front | Invention of the silicon chip is the major technical invention of the past century, making possible the computer age. |
| back | ad 1959 |
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| front | New Zealand introduces unrestricted women’s suffrage.At this point women win the principle of full political equality. |
| back | ad 1893 |
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| front | Invention of ironworkingMetallurgy is the key to further technical, economic and military developments. |
| back | bc 670 |
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