# Relationship history for MSHA mine 1515564

Current hierarchy: **Williams Darrell → Lucretius Coal Corp → No 1**

- 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

- **controller_controls_mine:** Sharon  Preece et al → No 1; 1986-01-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preece Energy Inc → No 1; 1986-03-01 to 1986-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Sharon  Preece et al → Preece Energy Inc; 1986-03-01 to 1986-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Timper Coal Company Inc → No 1; 1986-09-05 to 1990-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Salmons Carlos → No 1; 1986-09-05 to 1990-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Salmons Carlos → Timper Coal Company Inc; 1986-09-05 to 1990-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Lucretius Coal Corp → No 1; 1990-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williams Darrell → No 1; 1990-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Darrell → Lucretius Coal Corp; 1990-01-31 to current/open; source msha-controller-operator-history