# Relationship history for MSHA mine 1515415

Current hierarchy: **Franklin James F Jr → S J M Mining Company Inc → Mine No 1**

- 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:** Damron Coal Company → Mine No 1; 1985-10-01 to 1986-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Damron Robert L → Mine No 1; 1985-10-01 to 1986-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Damron Robert L → Damron Coal Company; 1985-10-01 to 1986-06-08; source msha-controller-operator-history
- **operator_operates_mine:** S J M Mining Company Inc → Mine No 1; 1986-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Franklin James F Jr → Mine No 1; 1986-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Franklin James F Jr → S J M Mining Company Inc; 1986-06-09 to current/open; source msha-controller-operator-history