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Pennsylvania Coal Co. v. Mahon

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In 1878, the Penn Coal Co. conveyed some land but reserved in the deed the right to remove all coal under the land. The grantee agreed to assume any resulting damage. Mahon, who later acquired the land, was bound by the deed. Mahon, wanting to prevent further mining under the land, claimed that a 1922 state law changed the coal company's rights. The law forbade the mining of coal in such a manner as to cause the subsistence of any structure used as a human habitation with certain exceptions.