During which era did sculptures make the tremendous advancement of using drills

The Flavian era

Explanation:

The sculptures make tremendous advancement of using drills during the Flavian era.

The Flavian dynasty who was a Roman imperial dynasty ruled over the Roman empire between the year 69 AD to 96 AD, During the Civil war of 69 AD was the year the Flavians Rose to power.

Various reforms were carried out by the Flavians which includes economic and cultural reforms.

The Flavians reign came to an end on September 18, 96. This was when Domitian was assassinated.

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