# Relationship history for MSHA mine 1513617

Current hierarchy: **Lawson Ronnie → T & R 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Three S Coal Company → No 1; 1982-07-01 to 1983-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Patterson Bill Et Al → No 1; 1982-07-01 to 1983-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Patterson Bill Et Al → Three S Coal Company; 1982-07-01 to 1983-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Lawson Ronnie Et Al → No 1; 1983-04-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & R Coal Company → No 1; 1983-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawson Ronnie Et Al → T & R Coal Company; 1983-07-19 to current/open; source msha-controller-operator-history