# Relationship history for MSHA mine 1515069

Current hierarchy: **Lawson Clarence & Sue → Lawson Coal Company → 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:** Mc Kiddy Reed → No 1; 1984-07-01 to 1985-12-22; source msha-controller-operator-history
- **operator_operates_mine:** R & R Coal Company → No 1; 1985-01-01 to 1985-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kiddy Reed → R & R Coal Company; 1985-01-01 to 1985-09-29; source msha-controller-operator-history
- **operator_operates_mine:** S & W Mining Company → No 1; 1985-09-30 to 1986-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Elliott Gary & Larry → No 1; 1985-09-30 to 1986-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Elliott Gary & Larry → S & W Mining Company; 1985-09-30 to 1986-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Lawson Coal Company → No 1; 1986-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lawson Clarence & Sue Et Al → No 1; 1986-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawson Clarence & Sue Et Al → Lawson Coal Company; 1986-04-21 to current/open; source msha-controller-operator-history