# Relationship history for MSHA mine 3603636

Current hierarchy: **Trent Robert D → Trent Coal Inc → Rice No 2**

- 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:** Trent Robert D → Rice No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harmony Mining Company → Rice No 2; 1950-01-01 to 1983-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Cimba Michael Jr--Warren Hinks Jr & Jack S Courtne → Rice No 2; 1950-01-01 to 1983-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Cimba Michael Jr--Warren Hinks Jr & Jack S Courtne → Harmony Mining Company; 1950-01-01 to 1983-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Harmony Mining Company → Rice No 2; 1983-10-10 to 1988-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Rockwood Holding Company → Rice No 2; 1983-10-10 to 1988-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Rockwood Holding Company → Harmony Mining Company; 1983-10-10 to 1988-10-11; source msha-controller-operator-history
- **operator_operates_mine:** Trent Coal Inc → Rice No 2; 1988-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trent Robert D → Trent Coal Inc; 1988-10-12 to current/open; source msha-controller-operator-history