# Relationship history for MSHA mine 0800015

Current hierarchy: **Tarmac Plc → Tarmac Florida Inc → Coral Aggregates**

- 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:** Coral Aggregates Corp → Coral Aggregates; 1950-01-01 to 1986-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Kearns Thomas N → Coral Aggregates; 1950-01-01 to 1986-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Kearns Thomas N → Coral Aggregates Corp; 1950-01-01 to 1986-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Tarmac Plc → Coral Aggregates; 1984-12-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac Florida Inc → Coral Aggregates; 1986-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tarmac Plc → Tarmac Florida Inc; 1986-11-25 to current/open; source msha-controller-operator-history