# Relationship history for MSHA mine 1514708

Current hierarchy: **Lee  Congleton → Richland Coal Company → Richland 37**

- 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:** Girdner Mining Company Inc → Richland 37; 1984-07-01 to 1993-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Troy Lee  Girdner → Richland 37; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy Lee  Girdner → Girdner Mining Company Inc; 1984-07-01 to 1993-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Lee  Congleton → Richland 37; 1985-09-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Richland Coal Company → Richland 37; 1993-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee  Congleton → Richland Coal Company; 1993-05-26 to current/open; source msha-controller-operator-history