It was formed by then Minister of Munitions Winston Churchill to produce mustard gas during World War I .
The National Smelting Company was a nationalised zinc smelting company in Avonmouth , United Kingdom .
National Smelting Company was formed by then Minister of Munitions Winston Churchill to produce mustard gas during World War I .
The National Smelting Company was a nationalised zinc smelting company in Avonmouth , United Kingdom .