Three men use big hammers to knock a large nail into some concrete in order to split it. A new device is demonstrated: the "hydraulic cartridge" which makes this kind of work much easier. C/U of the contraption in action. A hole is drilled, the cartridge is inserted, water poured in (after the operator takes a sip to prove it is pure water), and the lever turned. C/U of the hole as the concrete splits.
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