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Card 6

Front

When were atoms discovered?

Back

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Card 7

Front

what were the factories mainly producing?

Back

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Card 8

Front

When was dynamite invented?

Back

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Card 9

Front

When was the sewing machine invented?

Back

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Card 10

Front

Why was the steam engine so important?

Back

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Card 11

Front

Whi invented the light bulb?

Back

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Card 12

Front

In what year were roads made?

Back

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Card 13

Front

In what year was the arc lamp invented?

Back

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Card 14

Front

What did the arc lamp provide

Back

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Card 15

Front

In which year was the machine gun invented?

Back

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