# Relationship history for MSHA mine 1504383

Current hierarchy: **Lee  Congleton → Rocket Coal Company Inc → Prep Plant**

- 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:** Rocket Coal Company Inc → Prep Plant; 1950-01-01 to 1987-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Congleton Conley C → Prep Plant; 1950-01-01 to 1987-01-26; source msha-controller-operator-history
- **controller_controls_operator:** Congleton Conley C → Rocket Coal Company Inc; 1950-01-01 to 1987-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Rocket Coal Company Inc → Prep Plant; 1987-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lee  Congleton → Prep Plant; 1987-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee  Congleton → Rocket Coal Company Inc; 1987-01-27 to current/open; source msha-controller-operator-history