# Relationship history for MSHA mine 4606476

Current hierarchy: **Reel Curtis → Rama Drilling Company Inc → #3a Strip**

- 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:** Black Carbon Mining Company → #3a Strip; 1982-02-01 to 1982-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Bryant James → #3a Strip; 1982-02-01 to 1982-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Bryant James → Black Carbon Mining Company; 1982-02-01 to 1982-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Rama Drilling Company Inc → #3a Strip; 1982-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reel Curtis → #3a Strip; 1982-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reel Curtis → Rama Drilling Company Inc; 1982-10-22 to current/open; source msha-controller-operator-history