The man, from Halifax, had worked for the company for 12 years.
Speaking outside court, HSE principal inspector Kirsty Hirst said: “The tragic death of Mr Cole was devastating for his wife and family, and I hope today’s (February 22) guilty verdicts will help to provide a degree of closure.”
The jury at Leeds Crown Court unanimously found the manufacturer guilty on three counts last week. It had breached the Dangerous Substances and Explosive Atmosphere Regulations 2002 on one count and the Provision and Use of Work Equipment Regulations 1998 on two counts.