# Relationship history for MSHA mine 1510336

Current hierarchy: **Brown Homer → Brown Coal Company Inc → No 3**

- 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:** Brown Homer → No 3; 1976-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cheryl Black Star Coal Company Inc → No 3; 1977-04-01 to 1980-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Riggs Robert F → No 3; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riggs Robert F → Cheryl Black Star Coal Company Inc; 1977-04-01 to 1980-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Brown Coal Company Inc → No 3; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Homer → Brown Coal Company Inc; 1980-12-01 to current/open; source msha-controller-operator-history