# Relationship history for MSHA mine 0800181

Current hierarchy: **Bryan J  Olmert → Loncala Inc → MINEHEAD**

- 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:** Loncala Phosphate Company → MINEHEAD; 1950-01-01 to 1994-05-30; source msha-controller-operator-history
- **controller_controls_mine:** J H  Hill → MINEHEAD; 1950-01-01 to 1994-05-30; source msha-controller-operator-history
- **controller_controls_operator:** J H  Hill → Loncala Phosphate Company; 1950-01-01 to 1994-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Loncala Inc → MINEHEAD; 1994-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryan J  Olmert → MINEHEAD; 1994-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryan J  Olmert → Loncala Inc; 1994-05-31 to current/open; source msha-controller-operator-history