# Relationship history for MSHA mine 4406556

Current hierarchy: **Mullins John H → J H & M Coal Company → 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:** Sperow Joe → No 1; 1988-07-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C H & S Coal Company → No 1; 1989-11-01 to 1990-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Sperow Joe → C H & S Coal Company; 1989-11-01 to 1990-12-06; source msha-controller-operator-history
- **operator_operates_mine:** J H & M Coal Company → No 1; 1990-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins John H → No 1; 1990-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins John H → J H & M Coal Company; 1990-12-07 to current/open; source msha-controller-operator-history