# Relationship history for MSHA mine 4500555

Current hierarchy: **Burlington Resources Inc → Clarkland Inc → Highland Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Eucon Corporation → Highland Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kuney Max J Company → Highland Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** De Atley Company Inc → Highland Quarry; 1979-01-01 to 1981-07-05; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → De Atley Company Inc; 1979-01-01 to 1981-07-05; source msha-controller-operator-history
- **operator_operates_mine:** Max J Kuney Company → Highland Quarry; 1981-07-06 to 1983-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Kuney Max J Company → Max J Kuney Company; 1981-07-06 to 1983-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Burlington Resources Inc → Highland Quarry; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clarkland Inc → Highland Quarry; 1983-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burlington Resources Inc → Clarkland Inc; 1983-01-20 to current/open; source msha-controller-operator-history