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"PT Indira Dwi Mitra Specialist, Pabrikasi Steam Boiler- Thermal Oil Heater-Hot Water Boiler-Fire Tube Steam Boiler-Water Tube Vertical Boiler"
<https://idmboiler.co.id/Sales%20Burner%20Fire%20heating%20Industry%20Indonesia%20/boiler-functions-and-main-components/>