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People used slabs of stone as the first forms of bridges in order to cross over streams/rivers.
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The truss bridge was invented by an Italian architect
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This was the most common type of bridge built from Roman Times up until the Industrial Revolution.
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The first suspension bridge was built.
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The first cast-iron bridge was built during the Industrial revolution.
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The first Cantilever bridge was built
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These are designed using CAD. This is an adaptation of the before mentioned suspension bridge.