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David Vickers, 37, of Walton Yorkshire, was loading a skip onto the back of a lorry at Adis Scaffolding's Duckmanton site when the accident happened.
Brian Allen, 53, was feeding metal sheets into a conveyor coating machine when his wedding ring got caught on a moving part - ripping his finger from his hand.
Tom Massey, who trades under the company name Massey Roofing, was photographed with two other men sitting on the ridge of a building without wearing any safety equipment.
Astbury Design and Build had been employed by the affected house's neighbour to build a large extension on to their property.
The former worker, who wishes to remain anonymous, was employed by AAA Linen Services Park Royal headquarters in north-west London when the accident happened.
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