# Relationship history for MSHA mine 0101822

Current hierarchy: **Trotter Jack → Carl Coal Company → Pit 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Trotter Jack → Pit No 1; 1976-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Prescott John → Pit No 1; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boston Coal Company Inc → Pit No 1; 1977-11-01 to 1979-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Prescott John → Boston Coal Company Inc; 1977-11-01 to 1979-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Carl Coal Company → Pit No 1; 1979-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trotter Jack → Carl Coal Company; 1979-01-09 to current/open; source msha-controller-operator-history