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Ruhr, Germany: CU Fix hammer in box, hand removes gun. SCU Man putting charge in hammer. CU Man puts hammer on nail., on a piece of wood, on a concrete block. CU Man fires hammer. SCU Removes hammer. SV Man fires a nail into the other end, two men life plank & concrete. CU Fix-hammer drives nail into metal & concrete. SCU Man puts larger gun on to steel girder. SV Man fires gun. CU Man screwing nut onto bolt.
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