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How To Clean Gypsum Off Cast Iron Wheels Cart

1997-1-1Forged and cast-iron pipes were painted with molten pitch or wood tar at the close of medieval times. A work in 1827 states that pipes had been protected by coal tar for a long time 14. Before being buried, in 1847 cast-iron gas and water pipes were treated with tar in Hanover. In Germany the tarring of wooden roofs was known before 1770.

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