# Relationship history for MSHA mine 0801355

Current hierarchy: **CRH PLC; Natural Resources of Central Florida Inc → American Cement Company LLC → Sumterville Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** American Cement Company LLC → Sumterville Mine; 2007-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Natural Resources of Central Florida Inc  et al → Sumterville Mine; 2007-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Natural Resources of Central Florida Inc  et al → American Cement Company LLC; 2007-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC  et al → American Cement Company LLC; 2007-10-11 to current/open; source msha-controller-operator-history