# Relationship history for MSHA mine 1516052

Current hierarchy: **Patterson Bill → Shadow Coal Company → #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:** Runyon James Et Al → #1; 1984-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smooth Sailing Coal Company Inc → #1; 1987-05-01 to 1992-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Runyon James Et Al → Smooth Sailing Coal Company Inc; 1987-05-01 to 1992-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Shadow Coal Company → #1; 1992-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patterson Bill Et Al → #1; 1992-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patterson Bill Et Al → Shadow Coal Company; 1992-08-24 to current/open; source msha-controller-operator-history