Steven Allen received fatal head injuries when he was trapped by the machine during work on a new waste recycling plant in March 2007.
Bradford CoronerвЂ™s Court heard that none of the employees of contractor JN Bentley had read a manual describing how to safely operate the grab.
At the time of AllenвЂ™s death the machine had been used to lift bags of concrete on top of a wooden pallet despite the manual prohibiting its use for anything other than concrete blocks.
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