Boreholes have been around for a very long time, in fact, according to Wikipedia, it was first used by the Han Dynasty (202 BC – 220 AD) when the Chinese used deep borehole drilling for mining and other projects. The Chinese method back then was accomplished by a team of men jumping on and off a beam to impact the drilling bit while the actual boring tool was rotated by buffalo and oxen.

We have come a long way since then with technology changing, but what did it cost back in 1974?

Take a look for yourself:

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    14 12 2017

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