Which is the oldest industry in India?

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Which is the oldest rocks in India?

Earlier it was thought that the oldest rock of India belonged to sinngbhum craton (around 3700 my old). But as of now the oldest dated rock from India is TTG rocks from Bastar
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Where is the oldest surviving industrial furnace?

The oldest surviving industrial furnace is the Cornwall Iron Furnace. The furnace is located in Philadelphia, Pennsylvania. It is from the year 1742 which means it is over 250