history of welding tools Welding history begins with Egyptians, who used charcoal to pressure-weld swords as far back as 3000 B.C using process now known as forge welding. 2023-02-19 20:23:00
thorough training, hazard awareness needed for hvac workers In April 2012, Thornhill, Ont., heating, ventilation and air conditioning company sent supervisor and apprentice to repair HVAC unit, located on the roof at the rear of house. 2017-02-22 01:32:48
